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Finding the Fourth Proportional to 78,861.45, 118,402.89 and 75,290.70

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Solution

The fourth proportional to 78,861.45, 118,402.89 and 75,290.70 is: 113,041.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,861.45 : 118,402.89 = 75,290.70 : x
  2. Step 2: Convert to fraction form
    78,861.45/118,402.89 = 75,290.70/x
  3. Step 3: Cross multiply
    78,861.45x = 118,402.89 × 75,290.70
  4. Step 4: Simplify right side
    78,861.45x = 8,914,636,470.12
  5. Step 5: Solve for x
    x = 8,914,636,470.12/78,861.45
  6. Step 6: Final answer
    x = 113,041.75

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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.