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Finding the Fourth Proportional to 52.97, 79.45 and 20.91

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Solution

The fourth proportional to 52.97, 79.45 and 20.91 is: 31.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.97 : 79.45 = 20.91 : x
  2. Step 2: Convert to fraction form
    52.97/79.45 = 20.91/x
  3. Step 3: Cross multiply
    52.97x = 79.45 × 20.91
  4. Step 4: Simplify right side
    52.97x = 1,661.30
  5. Step 5: Solve for x
    x = 1,661.30/52.97
  6. Step 6: Final answer
    x = 31.36

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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.