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Finding the Fourth Proportional to 291.52, 402.13 and 212.73

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Solution

The fourth proportional to 291.52, 402.13 and 212.73 is: 293.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.52 : 402.13 = 212.73 : x
  2. Step 2: Convert to fraction form
    291.52/402.13 = 212.73/x
  3. Step 3: Cross multiply
    291.52x = 402.13 × 212.73
  4. Step 4: Simplify right side
    291.52x = 85,544.58
  5. Step 5: Solve for x
    x = 85,544.58/291.52
  6. Step 6: Final answer
    x = 293.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.