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Finding the Fourth Proportional to 99,990.60, 149,742.90 and 53,140.20

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Solution

The fourth proportional to 99,990.60, 149,742.90 and 53,140.20 is: 79,581.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,990.60 : 149,742.90 = 53,140.20 : x
  2. Step 2: Convert to fraction form
    99,990.60/149,742.90 = 53,140.20/x
  3. Step 3: Cross multiply
    99,990.60x = 149,742.90 × 53,140.20
  4. Step 4: Simplify right side
    99,990.60x = 7,957,367,654.58
  5. Step 5: Solve for x
    x = 7,957,367,654.58/99,990.60
  6. Step 6: Final answer
    x = 79,581.16

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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.