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Finding the Fourth Proportional to 278.40, 417.61 and 72.97

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Solution

The fourth proportional to 278.40, 417.61 and 72.97 is: 109.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.40 : 417.61 = 72.97 : x
  2. Step 2: Convert to fraction form
    278.40/417.61 = 72.97/x
  3. Step 3: Cross multiply
    278.40x = 417.61 × 72.97
  4. Step 4: Simplify right side
    278.40x = 30,470.73
  5. Step 5: Solve for x
    x = 30,470.73/278.40
  6. Step 6: Final answer
    x = 109.45

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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.