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Finding the Fourth Proportional to 81,143.70, 121,715.55 and 78,033.30

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Solution

The fourth proportional to 81,143.70, 121,715.55 and 78,033.30 is: 117,049.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,143.70 : 121,715.55 = 78,033.30 : x
  2. Step 2: Convert to fraction form
    81,143.70/121,715.55 = 78,033.30/x
  3. Step 3: Cross multiply
    81,143.70x = 121,715.55 × 78,033.30
  4. Step 4: Simplify right side
    81,143.70x = 9,497,866,027.82
  5. Step 5: Solve for x
    x = 9,497,866,027.82/81,143.70
  6. Step 6: Final answer
    x = 117,049.95

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1.5x scale

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.