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Finding the Fourth Proportional to 663,117.40, 915,101.70 and 361,311.40

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Solution

The fourth proportional to 663,117.40, 915,101.70 and 361,311.40 is: 498,609.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,117.40 : 915,101.70 = 361,311.40 : x
  2. Step 2: Convert to fraction form
    663,117.40/915,101.70 = 361,311.40/x
  3. Step 3: Cross multiply
    663,117.40x = 915,101.70 × 361,311.40
  4. Step 4: Simplify right side
    663,117.40x = 330,636,676,369.38
  5. Step 5: Solve for x
    x = 330,636,676,369.38/663,117.40
  6. Step 6: Final answer
    x = 498,609.56

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.