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Finding the Fourth Proportional to 78,173.40, 116,979.80 and 67,679.52

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Solution

The fourth proportional to 78,173.40, 116,979.80 and 67,679.52 is: 101,276.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,173.40 : 116,979.80 = 67,679.52 : x
  2. Step 2: Convert to fraction form
    78,173.40/116,979.80 = 67,679.52/x
  3. Step 3: Cross multiply
    78,173.40x = 116,979.80 × 67,679.52
  4. Step 4: Simplify right side
    78,173.40x = 7,917,136,713.70
  5. Step 5: Solve for x
    x = 7,917,136,713.70/78,173.40
  6. Step 6: Final answer
    x = 101,276.61

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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.