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Finding the Fourth Proportional to 52.92, 79.29 and 20.79

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Solution

The fourth proportional to 52.92, 79.29 and 20.79 is: 31.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.92 : 79.29 = 20.79 : x
  2. Step 2: Convert to fraction form
    52.92/79.29 = 20.79/x
  3. Step 3: Cross multiply
    52.92x = 79.29 × 20.79
  4. Step 4: Simplify right side
    52.92x = 1,648.44
  5. Step 5: Solve for x
    x = 1,648.44/52.92
  6. Step 6: Final answer
    x = 31.15

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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.