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Finding the Fourth Proportional to 111.90, 167.68 and 60.40

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Solution

The fourth proportional to 111.90, 167.68 and 60.40 is: 90.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.90 : 167.68 = 60.40 : x
  2. Step 2: Convert to fraction form
    111.90/167.68 = 60.40/x
  3. Step 3: Cross multiply
    111.90x = 167.68 × 60.40
  4. Step 4: Simplify right side
    111.90x = 10,127.87
  5. Step 5: Solve for x
    x = 10,127.87/111.90
  6. Step 6: Final answer
    x = 90.51

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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.