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Finding the Fourth Proportional to 357.90, 535.77 and 261.78

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Solution

The fourth proportional to 357.90, 535.77 and 261.78 is: 391.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.90 : 535.77 = 261.78 : x
  2. Step 2: Convert to fraction form
    357.90/535.77 = 261.78/x
  3. Step 3: Cross multiply
    357.90x = 535.77 × 261.78
  4. Step 4: Simplify right side
    357.90x = 140,253.87
  5. Step 5: Solve for x
    x = 140,253.87/357.90
  6. Step 6: Final answer
    x = 391.88

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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.