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Finding the Fourth Proportional to 547.20, 820.89 and 258.63

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Solution

The fourth proportional to 547.20, 820.89 and 258.63 is: 387.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.20 : 820.89 = 258.63 : x
  2. Step 2: Convert to fraction form
    547.20/820.89 = 258.63/x
  3. Step 3: Cross multiply
    547.20x = 820.89 × 258.63
  4. Step 4: Simplify right side
    547.20x = 212,306.78
  5. Step 5: Solve for x
    x = 212,306.78/547.20
  6. Step 6: Final answer
    x = 387.99

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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.