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Finding the Fourth Proportional to 278.05, 417.18 and 123.96

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Solution

The fourth proportional to 278.05, 417.18 and 123.96 is: 185.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.05 : 417.18 = 123.96 : x
  2. Step 2: Convert to fraction form
    278.05/417.18 = 123.96/x
  3. Step 3: Cross multiply
    278.05x = 417.18 × 123.96
  4. Step 4: Simplify right side
    278.05x = 51,714.73
  5. Step 5: Solve for x
    x = 51,714.73/278.05
  6. Step 6: Final answer
    x = 185.99

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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.