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Finding the Fourth Proportional to 278.80, 417.91 and 181.36

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Solution

The fourth proportional to 278.80, 417.91 and 181.36 is: 271.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.80 : 417.91 = 181.36 : x
  2. Step 2: Convert to fraction form
    278.80/417.91 = 181.36/x
  3. Step 3: Cross multiply
    278.80x = 417.91 × 181.36
  4. Step 4: Simplify right side
    278.80x = 75,792.16
  5. Step 5: Solve for x
    x = 75,792.16/278.80
  6. Step 6: Final answer
    x = 271.85

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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.