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Finding the Fourth Proportional to 65,685.62, 90,613.68 and 38,815.13

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Solution

The fourth proportional to 65,685.62, 90,613.68 and 38,815.13 is: 53,545.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,685.62 : 90,613.68 = 38,815.13 : x
  2. Step 2: Convert to fraction form
    65,685.62/90,613.68 = 38,815.13/x
  3. Step 3: Cross multiply
    65,685.62x = 90,613.68 × 38,815.13
  4. Step 4: Simplify right side
    65,685.62x = 3,517,181,768.98
  5. Step 5: Solve for x
    x = 3,517,181,768.98/65,685.62
  6. Step 6: Final answer
    x = 53,545.69

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Double scale
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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.