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Finding the Fourth Proportional to 126.15, 189.24 and 99.15

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Solution

The fourth proportional to 126.15, 189.24 and 99.15 is: 148.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.15 : 189.24 = 99.15 : x
  2. Step 2: Convert to fraction form
    126.15/189.24 = 99.15/x
  3. Step 3: Cross multiply
    126.15x = 189.24 × 99.15
  4. Step 4: Simplify right side
    126.15x = 18,763.15
  5. Step 5: Solve for x
    x = 18,763.15/126.15
  6. Step 6: Final answer
    x = 148.74

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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.