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Finding the Fourth Proportional to 136,421.60, 188,261.46 and 75,991.61

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Solution

The fourth proportional to 136,421.60, 188,261.46 and 75,991.61 is: 104,868.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,421.60 : 188,261.46 = 75,991.61 : x
  2. Step 2: Convert to fraction form
    136,421.60/188,261.46 = 75,991.61/x
  3. Step 3: Cross multiply
    136,421.60x = 188,261.46 × 75,991.61
  4. Step 4: Simplify right side
    136,421.60x = 14,306,290,505.04
  5. Step 5: Solve for x
    x = 14,306,290,505.04/136,421.60
  6. Step 6: Final answer
    x = 104,868.22

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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.