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Finding the Fourth Proportional to 253.52, 380.34 and 91.22

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Solution

The fourth proportional to 253.52, 380.34 and 91.22 is: 136.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.52 : 380.34 = 91.22 : x
  2. Step 2: Convert to fraction form
    253.52/380.34 = 91.22/x
  3. Step 3: Cross multiply
    253.52x = 380.34 × 91.22
  4. Step 4: Simplify right side
    253.52x = 34,692.71
  5. Step 5: Solve for x
    x = 34,692.71/253.52
  6. Step 6: Final answer
    x = 136.85

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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.