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Finding the Fourth Proportional to 100,939.38, 151,542.99 and 86,242.74

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Solution

The fourth proportional to 100,939.38, 151,542.99 and 86,242.74 is: 129,478.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,939.38 : 151,542.99 = 86,242.74 : x
  2. Step 2: Convert to fraction form
    100,939.38/151,542.99 = 86,242.74/x
  3. Step 3: Cross multiply
    100,939.38x = 151,542.99 × 86,242.74
  4. Step 4: Simplify right side
    100,939.38x = 13,069,482,685.39
  5. Step 5: Solve for x
    x = 13,069,482,685.39/100,939.38
  6. Step 6: Final answer
    x = 129,478.53

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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.