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Finding the Fourth Proportional to 51.79, 77.67 and 21.35

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Solution

The fourth proportional to 51.79, 77.67 and 21.35 is: 32.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.79 : 77.67 = 21.35 : x
  2. Step 2: Convert to fraction form
    51.79/77.67 = 21.35/x
  3. Step 3: Cross multiply
    51.79x = 77.67 × 21.35
  4. Step 4: Simplify right side
    51.79x = 1,658.25
  5. Step 5: Solve for x
    x = 1,658.25/51.79
  6. Step 6: Final answer
    x = 32.02

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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.