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Finding the Fourth Proportional to 278.47, 385.04 and 243.91

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Solution

The fourth proportional to 278.47, 385.04 and 243.91 is: 337.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.47 : 385.04 = 243.91 : x
  2. Step 2: Convert to fraction form
    278.47/385.04 = 243.91/x
  3. Step 3: Cross multiply
    278.47x = 385.04 × 243.91
  4. Step 4: Simplify right side
    278.47x = 93,911.96
  5. Step 5: Solve for x
    x = 93,911.96/278.47
  6. Step 6: Final answer
    x = 337.25

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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.