Home / 78,838.20-118,257.30-72,876.60

Finding the Fourth Proportional to 78,838.20, 118,257.30 and 72,876.60

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Solution

The fourth proportional to 78,838.20, 118,257.30 and 72,876.60 is: 109,314.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,838.20 : 118,257.30 = 72,876.60 : x
  2. Step 2: Convert to fraction form
    78,838.20/118,257.30 = 72,876.60/x
  3. Step 3: Cross multiply
    78,838.20x = 118,257.30 × 72,876.60
  4. Step 4: Simplify right side
    78,838.20x = 8,618,189,949.18
  5. Step 5: Solve for x
    x = 8,618,189,949.18/78,838.20
  6. Step 6: Final answer
    x = 109,314.90

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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.