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Finding the Fourth Proportional to 279.71, 385.55 and 213.10

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Solution

The fourth proportional to 279.71, 385.55 and 213.10 is: 293.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.71 : 385.55 = 213.10 : x
  2. Step 2: Convert to fraction form
    279.71/385.55 = 213.10/x
  3. Step 3: Cross multiply
    279.71x = 385.55 × 213.10
  4. Step 4: Simplify right side
    279.71x = 82,159.47
  5. Step 5: Solve for x
    x = 82,159.47/279.71
  6. Step 6: Final answer
    x = 293.73

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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.