Home / 81,132.79-112,536.05-78,974.95

Finding the Fourth Proportional to 81,132.79, 112,536.05 and 78,974.95

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Solution

The fourth proportional to 81,132.79, 112,536.05 and 78,974.95 is: 109,543.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,132.79 : 112,536.05 = 78,974.95 : x
  2. Step 2: Convert to fraction form
    81,132.79/112,536.05 = 78,974.95/x
  3. Step 3: Cross multiply
    81,132.79x = 112,536.05 × 78,974.95
  4. Step 4: Simplify right side
    81,132.79x = 8,887,528,921.95
  5. Step 5: Solve for x
    x = 8,887,528,921.95/81,132.79
  6. Step 6: Final answer
    x = 109,543.00

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.