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Finding the Fourth Proportional to 278.46, 417.74 and 95.81

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Solution

The fourth proportional to 278.46, 417.74 and 95.81 is: 143.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.46 : 417.74 = 95.81 : x
  2. Step 2: Convert to fraction form
    278.46/417.74 = 95.81/x
  3. Step 3: Cross multiply
    278.46x = 417.74 × 95.81
  4. Step 4: Simplify right side
    278.46x = 40,021.10
  5. Step 5: Solve for x
    x = 40,021.10/278.46
  6. Step 6: Final answer
    x = 143.72

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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.