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Finding the Fourth Proportional to 66,528.80, 99,793.20 and 19,781.68

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Solution

The fourth proportional to 66,528.80, 99,793.20 and 19,781.68 is: 29,672.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,528.80 : 99,793.20 = 19,781.68 : x
  2. Step 2: Convert to fraction form
    66,528.80/99,793.20 = 19,781.68/x
  3. Step 3: Cross multiply
    66,528.80x = 99,793.20 × 19,781.68
  4. Step 4: Simplify right side
    66,528.80x = 1,974,076,649.61
  5. Step 5: Solve for x
    x = 1,974,076,649.61/66,528.80
  6. Step 6: Final answer
    x = 29,672.51

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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.