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Finding the Fourth Proportional to 259.22, 387 and 213.66

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Solution

The fourth proportional to 259.22, 387 and 213.66 is: 318.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.22 : 387 = 213.66 : x
  2. Step 2: Convert to fraction form
    259.22/387 = 213.66/x
  3. Step 3: Cross multiply
    259.22x = 387 × 213.66
  4. Step 4: Simplify right side
    259.22x = 82,686.42
  5. Step 5: Solve for x
    x = 82,686.42/259.22
  6. Step 6: Final answer
    x = 318.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.