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Finding the Fourth Proportional to 111.75, 154.21 and 62.64

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Solution

The fourth proportional to 111.75, 154.21 and 62.64 is: 86.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.75 : 154.21 = 62.64 : x
  2. Step 2: Convert to fraction form
    111.75/154.21 = 62.64/x
  3. Step 3: Cross multiply
    111.75x = 154.21 × 62.64
  4. Step 4: Simplify right side
    111.75x = 9,659.71
  5. Step 5: Solve for x
    x = 9,659.71/111.75
  6. Step 6: Final answer
    x = 86.44

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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.