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Finding the Fourth Proportional to 85,909.71, 128,812.80 and 38,516.23

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Solution

The fourth proportional to 85,909.71, 128,812.80 and 38,516.23 is: 57,751.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.71 : 128,812.80 = 38,516.23 : x
  2. Step 2: Convert to fraction form
    85,909.71/128,812.80 = 38,516.23/x
  3. Step 3: Cross multiply
    85,909.71x = 128,812.80 × 38,516.23
  4. Step 4: Simplify right side
    85,909.71x = 4,961,382,795.97
  5. Step 5: Solve for x
    x = 4,961,382,795.97/85,909.71
  6. Step 6: Final answer
    x = 57,751.13

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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.