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Finding the Fourth Proportional to 547.95, 820.78 and 255.70

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Solution

The fourth proportional to 547.95, 820.78 and 255.70 is: 383.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    547.95 : 820.78 = 255.70 : x
  2. Step 2: Convert to fraction form
    547.95/820.78 = 255.70/x
  3. Step 3: Cross multiply
    547.95x = 820.78 × 255.70
  4. Step 4: Simplify right side
    547.95x = 209,873.83
  5. Step 5: Solve for x
    x = 209,873.83/547.95
  6. Step 6: Final answer
    x = 383.02

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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.