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Finding the Fourth Proportional to 52.87, 79.61 and 47.21

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Solution

The fourth proportional to 52.87, 79.61 and 47.21 is: 71.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.87 : 79.61 = 47.21 : x
  2. Step 2: Convert to fraction form
    52.87/79.61 = 47.21/x
  3. Step 3: Cross multiply
    52.87x = 79.61 × 47.21
  4. Step 4: Simplify right side
    52.87x = 3,758.39
  5. Step 5: Solve for x
    x = 3,758.39/52.87
  6. Step 6: Final answer
    x = 71.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.