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Finding the Fourth Proportional to 278.28, 383.46 and 258.82

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Solution

The fourth proportional to 278.28, 383.46 and 258.82 is: 356.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.28 : 383.46 = 258.82 : x
  2. Step 2: Convert to fraction form
    278.28/383.46 = 258.82/x
  3. Step 3: Cross multiply
    278.28x = 383.46 × 258.82
  4. Step 4: Simplify right side
    278.28x = 99,245.38
  5. Step 5: Solve for x
    x = 99,245.38/278.28
  6. Step 6: Final answer
    x = 356.64

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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.