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Finding the Fourth Proportional to 143,980.86, 198,691.65 and 80,319.72

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Solution

The fourth proportional to 143,980.86, 198,691.65 and 80,319.72 is: 110,840.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,980.86 : 198,691.65 = 80,319.72 : x
  2. Step 2: Convert to fraction form
    143,980.86/198,691.65 = 80,319.72/x
  3. Step 3: Cross multiply
    143,980.86x = 198,691.65 × 80,319.72
  4. Step 4: Simplify right side
    143,980.86x = 15,958,857,694.34
  5. Step 5: Solve for x
    x = 15,958,857,694.34/143,980.86
  6. Step 6: Final answer
    x = 110,840.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.