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Finding the Fourth Proportional to 71.23, 98.18 and 52.78

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Solution

The fourth proportional to 71.23, 98.18 and 52.78 is: 72.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.23 : 98.18 = 52.78 : x
  2. Step 2: Convert to fraction form
    71.23/98.18 = 52.78/x
  3. Step 3: Cross multiply
    71.23x = 98.18 × 52.78
  4. Step 4: Simplify right side
    71.23x = 5,181.94
  5. Step 5: Solve for x
    x = 5,181.94/71.23
  6. Step 6: Final answer
    x = 72.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.