Home / 81,008.40-121,512.60-72,479.10

Finding the Fourth Proportional to 81,008.40, 121,512.60 and 72,479.10

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Solution

The fourth proportional to 81,008.40, 121,512.60 and 72,479.10 is: 108,718.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,008.40 : 121,512.60 = 72,479.10 : x
  2. Step 2: Convert to fraction form
    81,008.40/121,512.60 = 72,479.10/x
  3. Step 3: Cross multiply
    81,008.40x = 121,512.60 × 72,479.10
  4. Step 4: Simplify right side
    81,008.40x = 8,807,123,886.66
  5. Step 5: Solve for x
    x = 8,807,123,886.66/81,008.40
  6. Step 6: Final answer
    x = 108,718.65

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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.