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Finding the Fourth Proportional to 278.39, 417.31 and 131.89

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Solution

The fourth proportional to 278.39, 417.31 and 131.89 is: 197.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.39 : 417.31 = 131.89 : x
  2. Step 2: Convert to fraction form
    278.39/417.31 = 131.89/x
  3. Step 3: Cross multiply
    278.39x = 417.31 × 131.89
  4. Step 4: Simplify right side
    278.39x = 55,037.66
  5. Step 5: Solve for x
    x = 55,037.66/278.39
  6. Step 6: Final answer
    x = 197.70

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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.