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Finding the Fourth Proportional to 253.66, 380.49 and 91.23

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Solution

The fourth proportional to 253.66, 380.49 and 91.23 is: 136.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.66 : 380.49 = 91.23 : x
  2. Step 2: Convert to fraction form
    253.66/380.49 = 91.23/x
  3. Step 3: Cross multiply
    253.66x = 380.49 × 91.23
  4. Step 4: Simplify right side
    253.66x = 34,712.10
  5. Step 5: Solve for x
    x = 34,712.10/253.66
  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.