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Finding the Fourth Proportional to 278.34, 417.11 and 220.31

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Solution

The fourth proportional to 278.34, 417.11 and 220.31 is: 330.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.34 : 417.11 = 220.31 : x
  2. Step 2: Convert to fraction form
    278.34/417.11 = 220.31/x
  3. Step 3: Cross multiply
    278.34x = 417.11 × 220.31
  4. Step 4: Simplify right side
    278.34x = 91,890.32
  5. Step 5: Solve for x
    x = 91,890.32/278.34
  6. Step 6: Final answer
    x = 330.14

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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.