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Finding the Fourth Proportional to 66,470.80, 99,706.20 and 38,477.20

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Solution

The fourth proportional to 66,470.80, 99,706.20 and 38,477.20 is: 57,715.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,470.80 : 99,706.20 = 38,477.20 : x
  2. Step 2: Convert to fraction form
    66,470.80/99,706.20 = 38,477.20/x
  3. Step 3: Cross multiply
    66,470.80x = 99,706.20 × 38,477.20
  4. Step 4: Simplify right side
    66,470.80x = 3,836,415,398.64
  5. Step 5: Solve for x
    x = 3,836,415,398.64/66,470.80
  6. Step 6: Final answer
    x = 57,715.80

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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.