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Finding the Fourth Proportional to 62.48, 86.16 and 55.18

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Solution

The fourth proportional to 62.48, 86.16 and 55.18 is: 76.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.48 : 86.16 = 55.18 : x
  2. Step 2: Convert to fraction form
    62.48/86.16 = 55.18/x
  3. Step 3: Cross multiply
    62.48x = 86.16 × 55.18
  4. Step 4: Simplify right side
    62.48x = 4,754.31
  5. Step 5: Solve for x
    x = 4,754.31/62.48
  6. Step 6: Final answer
    x = 76.09

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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.