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Finding the Fourth Proportional to 81,385.70, 122,157.45 and 39,295.47

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Solution

The fourth proportional to 81,385.70, 122,157.45 and 39,295.47 is: 58,981.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,385.70 : 122,157.45 = 39,295.47 : x
  2. Step 2: Convert to fraction form
    81,385.70/122,157.45 = 39,295.47/x
  3. Step 3: Cross multiply
    81,385.70x = 122,157.45 × 39,295.47
  4. Step 4: Simplify right side
    81,385.70x = 4,800,234,411.75
  5. Step 5: Solve for x
    x = 4,800,234,411.75/81,385.70
  6. Step 6: Final answer
    x = 58,981.30

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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.