Home / 81,131.79-112,534.67-78,973.95

Finding the Fourth Proportional to 81,131.79, 112,534.67 and 78,973.95

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Solution

The fourth proportional to 81,131.79, 112,534.67 and 78,973.95 is: 109,541.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,131.79 : 112,534.67 = 78,973.95 : x
  2. Step 2: Convert to fraction form
    81,131.79/112,534.67 = 78,973.95/x
  3. Step 3: Cross multiply
    81,131.79x = 112,534.67 × 78,973.95
  4. Step 4: Simplify right side
    81,131.79x = 8,887,307,006.98
  5. Step 5: Solve for x
    x = 8,887,307,006.98/81,131.79
  6. Step 6: Final answer
    x = 109,541.61

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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.