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Finding the Fourth Proportional to 129,976.60, 194,964.90 and 85,653.40

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Solution

The fourth proportional to 129,976.60, 194,964.90 and 85,653.40 is: 128,480.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,976.60 : 194,964.90 = 85,653.40 : x
  2. Step 2: Convert to fraction form
    129,976.60/194,964.90 = 85,653.40/x
  3. Step 3: Cross multiply
    129,976.60x = 194,964.90 × 85,653.40
  4. Step 4: Simplify right side
    129,976.60x = 16,699,406,565.66
  5. Step 5: Solve for x
    x = 16,699,406,565.66/129,976.60
  6. Step 6: Final answer
    x = 128,480.10

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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.