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Finding the Fourth Proportional to 278.46, 384.56 and 247.91

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Solution

The fourth proportional to 278.46, 384.56 and 247.91 is: 342.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.46 : 384.56 = 247.91 : x
  2. Step 2: Convert to fraction form
    278.46/384.56 = 247.91/x
  3. Step 3: Cross multiply
    278.46x = 384.56 × 247.91
  4. Step 4: Simplify right side
    278.46x = 95,333.11
  5. Step 5: Solve for x
    x = 95,333.11/278.46
  6. Step 6: Final answer
    x = 342.36

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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.