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Finding the Fourth Proportional to 278.79, 417.85 and 187.45

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Solution

The fourth proportional to 278.79, 417.85 and 187.45 is: 280.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 417.85 = 187.45 : x
  2. Step 2: Convert to fraction form
    278.79/417.85 = 187.45/x
  3. Step 3: Cross multiply
    278.79x = 417.85 × 187.45
  4. Step 4: Simplify right side
    278.79x = 78,325.98
  5. Step 5: Solve for x
    x = 78,325.98/278.79
  6. Step 6: Final answer
    x = 280.95

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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.