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Finding the Fourth Proportional to 111.21, 153.12 and 97.38

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Solution

The fourth proportional to 111.21, 153.12 and 97.38 is: 134.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.21 : 153.12 = 97.38 : x
  2. Step 2: Convert to fraction form
    111.21/153.12 = 97.38/x
  3. Step 3: Cross multiply
    111.21x = 153.12 × 97.38
  4. Step 4: Simplify right side
    111.21x = 14,910.83
  5. Step 5: Solve for x
    x = 14,910.83/111.21
  6. Step 6: Final answer
    x = 134.08

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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.