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Finding the Fourth Proportional to 253.72, 380.56 and 89.18

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Solution

The fourth proportional to 253.72, 380.56 and 89.18 is: 133.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.72 : 380.56 = 89.18 : x
  2. Step 2: Convert to fraction form
    253.72/380.56 = 89.18/x
  3. Step 3: Cross multiply
    253.72x = 380.56 × 89.18
  4. Step 4: Simplify right side
    253.72x = 33,938.34
  5. Step 5: Solve for x
    x = 33,938.34/253.72
  6. Step 6: Final answer
    x = 133.76

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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.