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Finding the Fourth Proportional to 136,689.28, 188,631.32 and 76,259.94

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Solution

The fourth proportional to 136,689.28, 188,631.32 and 76,259.94 is: 105,238.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,689.28 : 188,631.32 = 76,259.94 : x
  2. Step 2: Convert to fraction form
    136,689.28/188,631.32 = 76,259.94/x
  3. Step 3: Cross multiply
    136,689.28x = 188,631.32 × 76,259.94
  4. Step 4: Simplify right side
    136,689.28x = 14,385,013,145.32
  5. Step 5: Solve for x
    x = 14,385,013,145.32/136,689.28
  6. Step 6: Final answer
    x = 105,238.78

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