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Finding the Fourth Proportional to 81,247.76, 121,871.40 and 28,644.56

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Solution

The fourth proportional to 81,247.76, 121,871.40 and 28,644.56 is: 42,966.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,247.76 : 121,871.40 = 28,644.56 : x
  2. Step 2: Convert to fraction form
    81,247.76/121,871.40 = 28,644.56/x
  3. Step 3: Cross multiply
    81,247.76x = 121,871.40 × 28,644.56
  4. Step 4: Simplify right side
    81,247.76x = 3,490,952,629.58
  5. Step 5: Solve for x
    x = 3,490,952,629.58/81,247.76
  6. Step 6: Final answer
    x = 42,966.76

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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.