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Finding the Fourth Proportional to 81,245.40, 121,818.90 and 53,131.52

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Solution

The fourth proportional to 81,245.40, 121,818.90 and 53,131.52 is: 79,665.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,245.40 : 121,818.90 = 53,131.52 : x
  2. Step 2: Convert to fraction form
    81,245.40/121,818.90 = 53,131.52/x
  3. Step 3: Cross multiply
    81,245.40x = 121,818.90 × 53,131.52
  4. Step 4: Simplify right side
    81,245.40x = 6,472,423,321.73
  5. Step 5: Solve for x
    x = 6,472,423,321.73/81,245.40
  6. Step 6: Final answer
    x = 79,665.10

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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.