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Finding the Fourth Proportional to 278.72, 417.96 and 261.86

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Solution

The fourth proportional to 278.72, 417.96 and 261.86 is: 392.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.72 : 417.96 = 261.86 : x
  2. Step 2: Convert to fraction form
    278.72/417.96 = 261.86/x
  3. Step 3: Cross multiply
    278.72x = 417.96 × 261.86
  4. Step 4: Simplify right side
    278.72x = 109,447.01
  5. Step 5: Solve for x
    x = 109,447.01/278.72
  6. Step 6: Final answer
    x = 392.68

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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.