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Finding the Fourth Proportional to 81,279.81, 121,931.36 and 25,124.81

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Solution

The fourth proportional to 81,279.81, 121,931.36 and 25,124.81 is: 37,690.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,279.81 : 121,931.36 = 25,124.81 : x
  2. Step 2: Convert to fraction form
    81,279.81/121,931.36 = 25,124.81/x
  3. Step 3: Cross multiply
    81,279.81x = 121,931.36 × 25,124.81
  4. Step 4: Simplify right side
    81,279.81x = 3,063,501,517.76
  5. Step 5: Solve for x
    x = 3,063,501,517.76/81,279.81
  6. Step 6: Final answer
    x = 37,690.81

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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.