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Finding the Fourth Proportional to 278.35, 417.21 and 115.90

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Solution

The fourth proportional to 278.35, 417.21 and 115.90 is: 173.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.35 : 417.21 = 115.90 : x
  2. Step 2: Convert to fraction form
    278.35/417.21 = 115.90/x
  3. Step 3: Cross multiply
    278.35x = 417.21 × 115.90
  4. Step 4: Simplify right side
    278.35x = 48,354.64
  5. Step 5: Solve for x
    x = 48,354.64/278.35
  6. Step 6: Final answer
    x = 173.72

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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.