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Finding the Fourth Proportional to 136,169.76, 187,908.21 and 78,799.89

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Solution

The fourth proportional to 136,169.76, 187,908.21 and 78,799.89 is: 108,740.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,169.76 : 187,908.21 = 78,799.89 : x
  2. Step 2: Convert to fraction form
    136,169.76/187,908.21 = 78,799.89/x
  3. Step 3: Cross multiply
    136,169.76x = 187,908.21 × 78,799.89
  4. Step 4: Simplify right side
    136,169.76x = 14,807,146,278.10
  5. Step 5: Solve for x
    x = 14,807,146,278.10/136,169.76
  6. Step 6: Final answer
    x = 108,740.34

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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.