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Finding the Fourth Proportional to 52.97, 79.43 and 18.74

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Solution

The fourth proportional to 52.97, 79.43 and 18.74 is: 28.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.97 : 79.43 = 18.74 : x
  2. Step 2: Convert to fraction form
    52.97/79.43 = 18.74/x
  3. Step 3: Cross multiply
    52.97x = 79.43 × 18.74
  4. Step 4: Simplify right side
    52.97x = 1,488.03
  5. Step 5: Solve for x
    x = 1,488.03/52.97
  6. Step 6: Final answer
    x = 28.09

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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.