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Finding the Fourth Proportional to 52.71, 78.92 and 51.57

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Solution

The fourth proportional to 52.71, 78.92 and 51.57 is: 77.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.71 : 78.92 = 51.57 : x
  2. Step 2: Convert to fraction form
    52.71/78.92 = 51.57/x
  3. Step 3: Cross multiply
    52.71x = 78.92 × 51.57
  4. Step 4: Simplify right side
    52.71x = 4,069.90
  5. Step 5: Solve for x
    x = 4,069.90/52.71
  6. Step 6: Final answer
    x = 77.21

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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.