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Finding the Fourth Proportional to 67,991.20, 93,825.90 and 38,920.30

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Solution

The fourth proportional to 67,991.20, 93,825.90 and 38,920.30 is: 53,708.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,991.20 : 93,825.90 = 38,920.30 : x
  2. Step 2: Convert to fraction form
    67,991.20/93,825.90 = 38,920.30/x
  3. Step 3: Cross multiply
    67,991.20x = 93,825.90 × 38,920.30
  4. Step 4: Simplify right side
    67,991.20x = 3,651,732,175.77
  5. Step 5: Solve for x
    x = 3,651,732,175.77/67,991.20
  6. Step 6: Final answer
    x = 53,708.89

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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.