Home / 81,003.10-121,451.85-72,708.70

Finding the Fourth Proportional to 81,003.10, 121,451.85 and 72,708.70

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Solution

The fourth proportional to 81,003.10, 121,451.85 and 72,708.70 is: 109,015.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,003.10 : 121,451.85 = 72,708.70 : x
  2. Step 2: Convert to fraction form
    81,003.10/121,451.85 = 72,708.70/x
  3. Step 3: Cross multiply
    81,003.10x = 121,451.85 × 72,708.70
  4. Step 4: Simplify right side
    81,003.10x = 8,830,606,126.10
  5. Step 5: Solve for x
    x = 8,830,606,126.10/81,003.10
  6. Step 6: Final answer
    x = 109,015.66

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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.