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Finding the Fourth Proportional to 99,042.60, 148,636.80 and 39,920.70

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Solution

The fourth proportional to 99,042.60, 148,636.80 and 39,920.70 is: 59,910.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,042.60 : 148,636.80 = 39,920.70 : x
  2. Step 2: Convert to fraction form
    99,042.60/148,636.80 = 39,920.70/x
  3. Step 3: Cross multiply
    99,042.60x = 148,636.80 × 39,920.70
  4. Step 4: Simplify right side
    99,042.60x = 5,933,685,101.76
  5. Step 5: Solve for x
    x = 5,933,685,101.76/99,042.60
  6. Step 6: Final answer
    x = 59,910.43

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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.