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Finding the Fourth Proportional to 278.68, 417.78 and 218.08

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Solution

The fourth proportional to 278.68, 417.78 and 218.08 is: 326.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.68 : 417.78 = 218.08 : x
  2. Step 2: Convert to fraction form
    278.68/417.78 = 218.08/x
  3. Step 3: Cross multiply
    278.68x = 417.78 × 218.08
  4. Step 4: Simplify right side
    278.68x = 91,109.46
  5. Step 5: Solve for x
    x = 91,109.46/278.68
  6. Step 6: Final answer
    x = 326.93

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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.