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Finding the Fourth Proportional to 71,040.79, 106,577.85 and 21,121.30

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Solution

The fourth proportional to 71,040.79, 106,577.85 and 21,121.30 is: 31,686.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,040.79 : 106,577.85 = 21,121.30 : x
  2. Step 2: Convert to fraction form
    71,040.79/106,577.85 = 21,121.30/x
  3. Step 3: Cross multiply
    71,040.79x = 106,577.85 × 21,121.30
  4. Step 4: Simplify right side
    71,040.79x = 2,251,062,743.21
  5. Step 5: Solve for x
    x = 2,251,062,743.21/71,040.79
  6. Step 6: Final answer
    x = 31,686.90

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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.