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Finding the Fourth Proportional to 51.52, 77.20 and 21.06

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Solution

The fourth proportional to 51.52, 77.20 and 21.06 is: 31.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.52 : 77.20 = 21.06 : x
  2. Step 2: Convert to fraction form
    51.52/77.20 = 21.06/x
  3. Step 3: Cross multiply
    51.52x = 77.20 × 21.06
  4. Step 4: Simplify right side
    51.52x = 1,625.83
  5. Step 5: Solve for x
    x = 1,625.83/51.52
  6. Step 6: Final answer
    x = 31.56

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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.