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Finding the Fourth Proportional to 278.11, 417.28 and 141.24

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Solution

The fourth proportional to 278.11, 417.28 and 141.24 is: 211.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.11 : 417.28 = 141.24 : x
  2. Step 2: Convert to fraction form
    278.11/417.28 = 141.24/x
  3. Step 3: Cross multiply
    278.11x = 417.28 × 141.24
  4. Step 4: Simplify right side
    278.11x = 58,935.92
  5. Step 5: Solve for x
    x = 58,935.92/278.11
  6. Step 6: Final answer
    x = 211.92

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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.