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Finding the Fourth Proportional to 278.33, 417.20 and 115.86

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Solution

The fourth proportional to 278.33, 417.20 and 115.86 is: 173.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.33 : 417.20 = 115.86 : x
  2. Step 2: Convert to fraction form
    278.33/417.20 = 115.86/x
  3. Step 3: Cross multiply
    278.33x = 417.20 × 115.86
  4. Step 4: Simplify right side
    278.33x = 48,336.21
  5. Step 5: Solve for x
    x = 48,336.21/278.33
  6. Step 6: Final answer
    x = 173.66

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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.