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Finding the Fourth Proportional to 768.15, 1,151.96 and 357.21

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Solution

The fourth proportional to 768.15, 1,151.96 and 357.21 is: 535.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.15 : 1,151.96 = 357.21 : x
  2. Step 2: Convert to fraction form
    768.15/1,151.96 = 357.21/x
  3. Step 3: Cross multiply
    768.15x = 1,151.96 × 357.21
  4. Step 4: Simplify right side
    768.15x = 411,489.85
  5. Step 5: Solve for x
    x = 411,489.85/768.15
  6. Step 6: Final answer
    x = 535.69

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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.