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Finding the Fourth Proportional to 66,487.88, 99,748.12 and 19,740.80

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Solution

The fourth proportional to 66,487.88, 99,748.12 and 19,740.80 is: 29,616.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,487.88 : 99,748.12 = 19,740.80 : x
  2. Step 2: Convert to fraction form
    66,487.88/99,748.12 = 19,740.80/x
  3. Step 3: Cross multiply
    66,487.88x = 99,748.12 × 19,740.80
  4. Step 4: Simplify right side
    66,487.88x = 1,969,107,687.30
  5. Step 5: Solve for x
    x = 1,969,107,687.30/66,487.88
  6. Step 6: Final answer
    x = 29,616.04

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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.