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Finding the Fourth Proportional to 278.76, 417.40 and 162.88

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Solution

The fourth proportional to 278.76, 417.40 and 162.88 is: 243.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.76 : 417.40 = 162.88 : x
  2. Step 2: Convert to fraction form
    278.76/417.40 = 162.88/x
  3. Step 3: Cross multiply
    278.76x = 417.40 × 162.88
  4. Step 4: Simplify right side
    278.76x = 67,986.11
  5. Step 5: Solve for x
    x = 67,986.11/278.76
  6. Step 6: Final answer
    x = 243.89

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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.