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Finding the Fourth Proportional to 51.71, 77.51 and 21.25

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Solution

The fourth proportional to 51.71, 77.51 and 21.25 is: 31.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.71 : 77.51 = 21.25 : x
  2. Step 2: Convert to fraction form
    51.71/77.51 = 21.25/x
  3. Step 3: Cross multiply
    51.71x = 77.51 × 21.25
  4. Step 4: Simplify right side
    51.71x = 1,646.98
  5. Step 5: Solve for x
    x = 1,646.98/51.71
  6. Step 6: Final answer
    x = 31.85

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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.