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Finding the Fourth Proportional to 102.81, 153.42 and 91.28

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Solution

The fourth proportional to 102.81, 153.42 and 91.28 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.81 : 153.42 = 91.28 : x
  2. Step 2: Convert to fraction form
    102.81/153.42 = 91.28/x
  3. Step 3: Cross multiply
    102.81x = 153.42 × 91.28
  4. Step 4: Simplify right side
    102.81x = 14,003.41
  5. Step 5: Solve for x
    x = 14,003.41/102.81
  6. Step 6: Final answer
    x = 136.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.