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Finding the Fourth Proportional to 84,122.54, 125,931.72 and 81,131.72

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Solution

The fourth proportional to 84,122.54, 125,931.72 and 81,131.72 is: 121,454.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,122.54 : 125,931.72 = 81,131.72 : x
  2. Step 2: Convert to fraction form
    84,122.54/125,931.72 = 81,131.72/x
  3. Step 3: Cross multiply
    84,122.54x = 125,931.72 × 81,131.72
  4. Step 4: Simplify right side
    84,122.54x = 10,217,057,046.16
  5. Step 5: Solve for x
    x = 10,217,057,046.16/84,122.54
  6. Step 6: Final answer
    x = 121,454.45

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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.