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Finding the Fourth Proportional to 66,636.90, 99,972.65 and 19,889.78

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Solution

The fourth proportional to 66,636.90, 99,972.65 and 19,889.78 is: 29,839.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,636.90 : 99,972.65 = 19,889.78 : x
  2. Step 2: Convert to fraction form
    66,636.90/99,972.65 = 19,889.78/x
  3. Step 3: Cross multiply
    66,636.90x = 99,972.65 × 19,889.78
  4. Step 4: Simplify right side
    66,636.90x = 1,988,434,014.52
  5. Step 5: Solve for x
    x = 1,988,434,014.52/66,636.90
  6. Step 6: Final answer
    x = 29,839.83

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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.