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Finding the Fourth Proportional to 86,565.80, 129,945.90 and 66,931.40

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Solution

The fourth proportional to 86,565.80, 129,945.90 and 66,931.40 is: 100,472.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,565.80 : 129,945.90 = 66,931.40 : x
  2. Step 2: Convert to fraction form
    86,565.80/129,945.90 = 66,931.40/x
  3. Step 3: Cross multiply
    86,565.80x = 129,945.90 × 66,931.40
  4. Step 4: Simplify right side
    86,565.80x = 8,697,461,011.26
  5. Step 5: Solve for x
    x = 8,697,461,011.26/86,565.80
  6. Step 6: Final answer
    x = 100,472.25

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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.