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Finding the Fourth Proportional to 80,644.70, 120,823.05 and 38,999.90

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Solution

The fourth proportional to 80,644.70, 120,823.05 and 38,999.90 is: 58,430.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,644.70 : 120,823.05 = 38,999.90 : x
  2. Step 2: Convert to fraction form
    80,644.70/120,823.05 = 38,999.90/x
  3. Step 3: Cross multiply
    80,644.70x = 120,823.05 × 38,999.90
  4. Step 4: Simplify right side
    80,644.70x = 4,712,086,867.70
  5. Step 5: Solve for x
    x = 4,712,086,867.70/80,644.70
  6. Step 6: Final answer
    x = 58,430.21

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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.