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Finding the Fourth Proportional to 111.67, 154.11 and 62.55

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Solution

The fourth proportional to 111.67, 154.11 and 62.55 is: 86.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.67 : 154.11 = 62.55 : x
  2. Step 2: Convert to fraction form
    111.67/154.11 = 62.55/x
  3. Step 3: Cross multiply
    111.67x = 154.11 × 62.55
  4. Step 4: Simplify right side
    111.67x = 9,638.50
  5. Step 5: Solve for x
    x = 9,638.50/111.67
  6. Step 6: Final answer
    x = 86.32

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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.