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Finding the Fourth Proportional to 71,040.60, 106,542.40 and 21,108.96

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Solution

The fourth proportional to 71,040.60, 106,542.40 and 21,108.96 is: 31,657.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,040.60 : 106,542.40 = 21,108.96 : x
  2. Step 2: Convert to fraction form
    71,040.60/106,542.40 = 21,108.96/x
  3. Step 3: Cross multiply
    71,040.60x = 106,542.40 × 21,108.96
  4. Step 4: Simplify right side
    71,040.60x = 2,248,999,259.90
  5. Step 5: Solve for x
    x = 2,248,999,259.90/71,040.60
  6. Step 6: Final answer
    x = 31,657.94

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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.