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Finding the Fourth Proportional to 278.91, 385.08 and 260.55

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Solution

The fourth proportional to 278.91, 385.08 and 260.55 is: 359.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.91 : 385.08 = 260.55 : x
  2. Step 2: Convert to fraction form
    278.91/385.08 = 260.55/x
  3. Step 3: Cross multiply
    278.91x = 385.08 × 260.55
  4. Step 4: Simplify right side
    278.91x = 100,332.59
  5. Step 5: Solve for x
    x = 100,332.59/278.91
  6. Step 6: Final answer
    x = 359.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.