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Finding the Fourth Proportional to 126, 188.71 and 104.29

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Solution

The fourth proportional to 126, 188.71 and 104.29 is: 156.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    126 : 188.71 = 104.29 : x
  2. Step 2: Convert to fraction form
    126/188.71 = 104.29/x
  3. Step 3: Cross multiply
    126x = 188.71 × 104.29
  4. Step 4: Simplify right side
    126x = 19,679.83
  5. Step 5: Solve for x
    x = 19,679.83/126
  6. Step 6: Final answer
    x = 156.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.