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Finding the Fourth Proportional to 126.43, 189.40 and 72.16

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Solution

The fourth proportional to 126.43, 189.40 and 72.16 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.43 : 189.40 = 72.16 : x
  2. Step 2: Convert to fraction form
    126.43/189.40 = 72.16/x
  3. Step 3: Cross multiply
    126.43x = 189.40 × 72.16
  4. Step 4: Simplify right side
    126.43x = 13,666.16
  5. Step 5: Solve for x
    x = 13,666.16/126.43
  6. Step 6: Final answer
    x = 108.10

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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.