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Finding the Fourth Proportional to 51.57, 77.30 and 21.16

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Solution

The fourth proportional to 51.57, 77.30 and 21.16 is: 31.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.57 : 77.30 = 21.16 : x
  2. Step 2: Convert to fraction form
    51.57/77.30 = 21.16/x
  3. Step 3: Cross multiply
    51.57x = 77.30 × 21.16
  4. Step 4: Simplify right side
    51.57x = 1,635.86
  5. Step 5: Solve for x
    x = 1,635.86/51.57
  6. Step 6: Final answer
    x = 31.72

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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.