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Finding the Fourth Proportional to 52.55, 78.78 and 28.15

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Solution

The fourth proportional to 52.55, 78.78 and 28.15 is: 42.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.55 : 78.78 = 28.15 : x
  2. Step 2: Convert to fraction form
    52.55/78.78 = 28.15/x
  3. Step 3: Cross multiply
    52.55x = 78.78 × 28.15
  4. Step 4: Simplify right side
    52.55x = 2,217.57
  5. Step 5: Solve for x
    x = 2,217.57/52.55
  6. Step 6: Final answer
    x = 42.20

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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.