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Finding the Fourth Proportional to 63.12, 87.16 and 58.20

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Solution

The fourth proportional to 63.12, 87.16 and 58.20 is: 80.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.12 : 87.16 = 58.20 : x
  2. Step 2: Convert to fraction form
    63.12/87.16 = 58.20/x
  3. Step 3: Cross multiply
    63.12x = 87.16 × 58.20
  4. Step 4: Simplify right side
    63.12x = 5,072.71
  5. Step 5: Solve for x
    x = 5,072.71/63.12
  6. Step 6: Final answer
    x = 80.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.