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Finding the Fourth Proportional to 66,445.78, 99,651.69 and 19,687.72

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Solution

The fourth proportional to 66,445.78, 99,651.69 and 19,687.72 is: 29,526.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,445.78 : 99,651.69 = 19,687.72 : x
  2. Step 2: Convert to fraction form
    66,445.78/99,651.69 = 19,687.72/x
  3. Step 3: Cross multiply
    66,445.78x = 99,651.69 × 19,687.72
  4. Step 4: Simplify right side
    66,445.78x = 1,961,914,570.25
  5. Step 5: Solve for x
    x = 1,961,914,570.25/66,445.78
  6. Step 6: Final answer
    x = 29,526.55

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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.