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Finding the Fourth Proportional to 253.78, 380.70 and 91.52

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Solution

The fourth proportional to 253.78, 380.70 and 91.52 is: 137.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.78 : 380.70 = 91.52 : x
  2. Step 2: Convert to fraction form
    253.78/380.70 = 91.52/x
  3. Step 3: Cross multiply
    253.78x = 380.70 × 91.52
  4. Step 4: Simplify right side
    253.78x = 34,841.66
  5. Step 5: Solve for x
    x = 34,841.66/253.78
  6. Step 6: Final answer
    x = 137.29

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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.