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Finding the Fourth Proportional to 66,520.80, 91,802.16 and 38,229.12

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Solution

The fourth proportional to 66,520.80, 91,802.16 and 38,229.12 is: 52,758.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,520.80 : 91,802.16 = 38,229.12 : x
  2. Step 2: Convert to fraction form
    66,520.80/91,802.16 = 38,229.12/x
  3. Step 3: Cross multiply
    66,520.80x = 91,802.16 × 38,229.12
  4. Step 4: Simplify right side
    66,520.80x = 3,509,515,790.90
  5. Step 5: Solve for x
    x = 3,509,515,790.90/66,520.80
  6. Step 6: Final answer
    x = 52,758.17

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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.