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Finding the Fourth Proportional to 278.95, 418.86 and 240.87

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Solution

The fourth proportional to 278.95, 418.86 and 240.87 is: 361.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.95 : 418.86 = 240.87 : x
  2. Step 2: Convert to fraction form
    278.95/418.86 = 240.87/x
  3. Step 3: Cross multiply
    278.95x = 418.86 × 240.87
  4. Step 4: Simplify right side
    278.95x = 100,890.81
  5. Step 5: Solve for x
    x = 100,890.81/278.95
  6. Step 6: Final answer
    x = 361.68

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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.