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Finding the Fourth Proportional to 126.63, 189.87 and 58.16

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Solution

The fourth proportional to 126.63, 189.87 and 58.16 is: 87.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.63 : 189.87 = 58.16 : x
  2. Step 2: Convert to fraction form
    126.63/189.87 = 58.16/x
  3. Step 3: Cross multiply
    126.63x = 189.87 × 58.16
  4. Step 4: Simplify right side
    126.63x = 11,043.10
  5. Step 5: Solve for x
    x = 11,043.10/126.63
  6. Step 6: Final answer
    x = 87.21

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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.