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Finding the Fourth Proportional to 278.40, 417.51 and 170.18

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Solution

The fourth proportional to 278.40, 417.51 and 170.18 is: 255.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.40 : 417.51 = 170.18 : x
  2. Step 2: Convert to fraction form
    278.40/417.51 = 170.18/x
  3. Step 3: Cross multiply
    278.40x = 417.51 × 170.18
  4. Step 4: Simplify right side
    278.40x = 71,049.76
  5. Step 5: Solve for x
    x = 71,049.76/278.40
  6. Step 6: Final answer
    x = 255.21

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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.