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Finding the Fourth Proportional to 278.14, 383.88 and 171.85

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Solution

The fourth proportional to 278.14, 383.88 and 171.85 is: 237.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.14 : 383.88 = 171.85 : x
  2. Step 2: Convert to fraction form
    278.14/383.88 = 171.85/x
  3. Step 3: Cross multiply
    278.14x = 383.88 × 171.85
  4. Step 4: Simplify right side
    278.14x = 65,969.78
  5. Step 5: Solve for x
    x = 65,969.78/278.14
  6. Step 6: Final answer
    x = 237.18

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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.