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Finding the Fourth Proportional to 81,158.40, 121,737.60 and 53,164.80

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Solution

The fourth proportional to 81,158.40, 121,737.60 and 53,164.80 is: 79,747.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,158.40 : 121,737.60 = 53,164.80 : x
  2. Step 2: Convert to fraction form
    81,158.40/121,737.60 = 53,164.80/x
  3. Step 3: Cross multiply
    81,158.40x = 121,737.60 × 53,164.80
  4. Step 4: Simplify right side
    81,158.40x = 6,472,155,156.48
  5. Step 5: Solve for x
    x = 6,472,155,156.48/81,158.40
  6. Step 6: Final answer
    x = 79,747.20

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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.