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Finding the Fourth Proportional to 53.78, 80.67 and 17.71

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Solution

The fourth proportional to 53.78, 80.67 and 17.71 is: 26.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.78 : 80.67 = 17.71 : x
  2. Step 2: Convert to fraction form
    53.78/80.67 = 17.71/x
  3. Step 3: Cross multiply
    53.78x = 80.67 × 17.71
  4. Step 4: Simplify right side
    53.78x = 1,428.91
  5. Step 5: Solve for x
    x = 1,428.91/53.78
  6. Step 6: Final answer
    x = 26.57

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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.