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Finding the Fourth Proportional to 259.34, 388.31 and 213.89

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Solution

The fourth proportional to 259.34, 388.31 and 213.89 is: 320.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.34 : 388.31 = 213.89 : x
  2. Step 2: Convert to fraction form
    259.34/388.31 = 213.89/x
  3. Step 3: Cross multiply
    259.34x = 388.31 × 213.89
  4. Step 4: Simplify right side
    259.34x = 83,052.61
  5. Step 5: Solve for x
    x = 83,052.61/259.34
  6. Step 6: Final answer
    x = 320.25

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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.