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Finding the Fourth Proportional to 768.18, 1,151.91 and 621.57

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Solution

The fourth proportional to 768.18, 1,151.91 and 621.57 is: 932.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.18 : 1,151.91 = 621.57 : x
  2. Step 2: Convert to fraction form
    768.18/1,151.91 = 621.57/x
  3. Step 3: Cross multiply
    768.18x = 1,151.91 × 621.57
  4. Step 4: Simplify right side
    768.18x = 715,992.70
  5. Step 5: Solve for x
    x = 715,992.70/768.18
  6. Step 6: Final answer
    x = 932.06

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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.