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Finding the Fourth Proportional to 78,920.70, 118,375.65 and 25,611.90

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Solution

The fourth proportional to 78,920.70, 118,375.65 and 25,611.90 is: 38,416.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,920.70 : 118,375.65 = 25,611.90 : x
  2. Step 2: Convert to fraction form
    78,920.70/118,375.65 = 25,611.90/x
  3. Step 3: Cross multiply
    78,920.70x = 118,375.65 × 25,611.90
  4. Step 4: Simplify right side
    78,920.70x = 3,031,825,310.24
  5. Step 5: Solve for x
    x = 3,031,825,310.24/78,920.70
  6. Step 6: Final answer
    x = 38,416.10

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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.