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Finding the Fourth Proportional to 126.68, 189.60 and 75.18

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Solution

The fourth proportional to 126.68, 189.60 and 75.18 is: 112.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.68 : 189.60 = 75.18 : x
  2. Step 2: Convert to fraction form
    126.68/189.60 = 75.18/x
  3. Step 3: Cross multiply
    126.68x = 189.60 × 75.18
  4. Step 4: Simplify right side
    126.68x = 14,254.13
  5. Step 5: Solve for x
    x = 14,254.13/126.68
  6. Step 6: Final answer
    x = 112.52

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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.