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Finding the Fourth Proportional to 278.48, 417.42 and 217.40

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Solution

The fourth proportional to 278.48, 417.42 and 217.40 is: 325.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.48 : 417.42 = 217.40 : x
  2. Step 2: Convert to fraction form
    278.48/417.42 = 217.40/x
  3. Step 3: Cross multiply
    278.48x = 417.42 × 217.40
  4. Step 4: Simplify right side
    278.48x = 90,747.11
  5. Step 5: Solve for x
    x = 90,747.11/278.48
  6. Step 6: Final answer
    x = 325.87

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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.