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Finding the Fourth Proportional to 66,486.90, 99,729.54 and 19,103.10

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Solution

The fourth proportional to 66,486.90, 99,729.54 and 19,103.10 is: 28,654.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,486.90 : 99,729.54 = 19,103.10 : x
  2. Step 2: Convert to fraction form
    66,486.90/99,729.54 = 19,103.10/x
  3. Step 3: Cross multiply
    66,486.90x = 99,729.54 × 19,103.10
  4. Step 4: Simplify right side
    66,486.90x = 1,905,143,375.57
  5. Step 5: Solve for x
    x = 1,905,143,375.57/66,486.90
  6. Step 6: Final answer
    x = 28,654.42

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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.