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Finding the Fourth Proportional to 278.40, 417.76 and 162.96

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Solution

The fourth proportional to 278.40, 417.76 and 162.96 is: 244.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.40 : 417.76 = 162.96 : x
  2. Step 2: Convert to fraction form
    278.40/417.76 = 162.96/x
  3. Step 3: Cross multiply
    278.40x = 417.76 × 162.96
  4. Step 4: Simplify right side
    278.40x = 68,078.17
  5. Step 5: Solve for x
    x = 68,078.17/278.40
  6. Step 6: Final answer
    x = 244.53

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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.