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Finding the Fourth Proportional to 78,680.70, 118,251.45 and 68,543.10

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Solution

The fourth proportional to 78,680.70, 118,251.45 and 68,543.10 is: 103,015.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,680.70 : 118,251.45 = 68,543.10 : x
  2. Step 2: Convert to fraction form
    78,680.70/118,251.45 = 68,543.10/x
  3. Step 3: Cross multiply
    78,680.70x = 118,251.45 × 68,543.10
  4. Step 4: Simplify right side
    78,680.70x = 8,105,320,962.50
  5. Step 5: Solve for x
    x = 8,105,320,962.50/78,680.70
  6. Step 6: Final answer
    x = 103,015.36

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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.