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Finding the Fourth Proportional to 71,911.20, 107,866.80 and 68,630.70

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Solution

The fourth proportional to 71,911.20, 107,866.80 and 68,630.70 is: 102,946.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,911.20 : 107,866.80 = 68,630.70 : x
  2. Step 2: Convert to fraction form
    71,911.20/107,866.80 = 68,630.70/x
  3. Step 3: Cross multiply
    71,911.20x = 107,866.80 × 68,630.70
  4. Step 4: Simplify right side
    71,911.20x = 7,402,973,990.76
  5. Step 5: Solve for x
    x = 7,402,973,990.76/71,911.20
  6. Step 6: Final answer
    x = 102,946.05

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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.