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Finding the Fourth Proportional to 111.02, 153.20 and 63.76

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Solution

The fourth proportional to 111.02, 153.20 and 63.76 is: 87.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.02 : 153.20 = 63.76 : x
  2. Step 2: Convert to fraction form
    111.02/153.20 = 63.76/x
  3. Step 3: Cross multiply
    111.02x = 153.20 × 63.76
  4. Step 4: Simplify right side
    111.02x = 9,768.03
  5. Step 5: Solve for x
    x = 9,768.03/111.02
  6. Step 6: Final answer
    x = 87.98

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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.