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Finding the Fourth Proportional to 494.78, 742.10 and 271.87

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Solution

The fourth proportional to 494.78, 742.10 and 271.87 is: 407.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.78 : 742.10 = 271.87 : x
  2. Step 2: Convert to fraction form
    494.78/742.10 = 271.87/x
  3. Step 3: Cross multiply
    494.78x = 742.10 × 271.87
  4. Step 4: Simplify right side
    494.78x = 201,751.51
  5. Step 5: Solve for x
    x = 201,751.51/494.78
  6. Step 6: Final answer
    x = 407.76

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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.