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Finding the Fourth Proportional to 278.33, 417.42 and 217.31

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Solution

The fourth proportional to 278.33, 417.42 and 217.31 is: 325.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.33 : 417.42 = 217.31 : x
  2. Step 2: Convert to fraction form
    278.33/417.42 = 217.31/x
  3. Step 3: Cross multiply
    278.33x = 417.42 × 217.31
  4. Step 4: Simplify right side
    278.33x = 90,707.45
  5. Step 5: Solve for x
    x = 90,707.45/278.33
  6. Step 6: Final answer
    x = 325.90

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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.