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Finding the Fourth Proportional to 78,491.80, 117,737.70 and 34,139.80

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Solution

The fourth proportional to 78,491.80, 117,737.70 and 34,139.80 is: 51,209.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,491.80 : 117,737.70 = 34,139.80 : x
  2. Step 2: Convert to fraction form
    78,491.80/117,737.70 = 34,139.80/x
  3. Step 3: Cross multiply
    78,491.80x = 117,737.70 × 34,139.80
  4. Step 4: Simplify right side
    78,491.80x = 4,019,541,530.46
  5. Step 5: Solve for x
    x = 4,019,541,530.46/78,491.80
  6. Step 6: Final answer
    x = 51,209.70

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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.