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Finding the Fourth Proportional to 253.27, 379.91 and 88.78

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Solution

The fourth proportional to 253.27, 379.91 and 88.78 is: 133.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.27 : 379.91 = 88.78 : x
  2. Step 2: Convert to fraction form
    253.27/379.91 = 88.78/x
  3. Step 3: Cross multiply
    253.27x = 379.91 × 88.78
  4. Step 4: Simplify right side
    253.27x = 33,727.02
  5. Step 5: Solve for x
    x = 33,727.02/253.27
  6. Step 6: Final answer
    x = 133.17

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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.