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Finding the Fourth Proportional to 568.78, 851.55 and 385.90

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Solution

The fourth proportional to 568.78, 851.55 and 385.90 is: 577.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.78 : 851.55 = 385.90 : x
  2. Step 2: Convert to fraction form
    568.78/851.55 = 385.90/x
  3. Step 3: Cross multiply
    568.78x = 851.55 × 385.90
  4. Step 4: Simplify right side
    568.78x = 328,613.15
  5. Step 5: Solve for x
    x = 328,613.15/568.78
  6. Step 6: Final answer
    x = 577.75

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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.