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Finding the Fourth Proportional to 111.54, 153.92 and 64.90

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Solution

The fourth proportional to 111.54, 153.92 and 64.90 is: 89.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.54 : 153.92 = 64.90 : x
  2. Step 2: Convert to fraction form
    111.54/153.92 = 64.90/x
  3. Step 3: Cross multiply
    111.54x = 153.92 × 64.90
  4. Step 4: Simplify right side
    111.54x = 9,989.41
  5. Step 5: Solve for x
    x = 9,989.41/111.54
  6. Step 6: Final answer
    x = 89.56

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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.