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Finding the Fourth Proportional to 278.22, 416.79 and 239.70

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Solution

The fourth proportional to 278.22, 416.79 and 239.70 is: 359.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.22 : 416.79 = 239.70 : x
  2. Step 2: Convert to fraction form
    278.22/416.79 = 239.70/x
  3. Step 3: Cross multiply
    278.22x = 416.79 × 239.70
  4. Step 4: Simplify right side
    278.22x = 99,904.56
  5. Step 5: Solve for x
    x = 99,904.56/278.22
  6. Step 6: Final answer
    x = 359.08

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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.