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Finding the Fourth Proportional to 547.26, 821.26 and 258.78

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Solution

The fourth proportional to 547.26, 821.26 and 258.78 is: 388.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.26 : 821.26 = 258.78 : x
  2. Step 2: Convert to fraction form
    547.26/821.26 = 258.78/x
  3. Step 3: Cross multiply
    547.26x = 821.26 × 258.78
  4. Step 4: Simplify right side
    547.26x = 212,525.66
  5. Step 5: Solve for x
    x = 212,525.66/547.26
  6. Step 6: Final answer
    x = 388.34

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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.