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Finding the Fourth Proportional to 278.79, 417.91 and 116.61

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Solution

The fourth proportional to 278.79, 417.91 and 116.61 is: 174.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 417.91 = 116.61 : x
  2. Step 2: Convert to fraction form
    278.79/417.91 = 116.61/x
  3. Step 3: Cross multiply
    278.79x = 417.91 × 116.61
  4. Step 4: Simplify right side
    278.79x = 48,732.49
  5. Step 5: Solve for x
    x = 48,732.49/278.79
  6. Step 6: Final answer
    x = 174.80

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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.