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Finding the Fourth Proportional to 136,689.31, 188,631.37 and 76,259.97

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Solution

The fourth proportional to 136,689.31, 188,631.37 and 76,259.97 is: 105,238.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,689.31 : 188,631.37 = 76,259.97 : x
  2. Step 2: Convert to fraction form
    136,689.31/188,631.37 = 76,259.97/x
  3. Step 3: Cross multiply
    136,689.31x = 188,631.37 × 76,259.97
  4. Step 4: Simplify right side
    136,689.31x = 14,385,021,292.80
  5. Step 5: Solve for x
    x = 14,385,021,292.80/136,689.31
  6. Step 6: Final answer
    x = 105,238.82

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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.