Home / 656,819.10-985,228.65-420,623.10

Finding the Fourth Proportional to 656,819.10, 985,228.65 and 420,623.10

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Solution

The fourth proportional to 656,819.10, 985,228.65 and 420,623.10 is: 630,934.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,819.10 : 985,228.65 = 420,623.10 : x
  2. Step 2: Convert to fraction form
    656,819.10/985,228.65 = 420,623.10/x
  3. Step 3: Cross multiply
    656,819.10x = 985,228.65 × 420,623.10
  4. Step 4: Simplify right side
    656,819.10x = 414,409,928,971.82
  5. Step 5: Solve for x
    x = 414,409,928,971.82/656,819.10
  6. Step 6: Final answer
    x = 630,934.65

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.