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Finding the Fourth Proportional to 768.74, 1,151.48 and 638.42

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Solution

The fourth proportional to 768.74, 1,151.48 and 638.42 is: 956.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.74 : 1,151.48 = 638.42 : x
  2. Step 2: Convert to fraction form
    768.74/1,151.48 = 638.42/x
  3. Step 3: Cross multiply
    768.74x = 1,151.48 × 638.42
  4. Step 4: Simplify right side
    768.74x = 735,127.86
  5. Step 5: Solve for x
    x = 735,127.86/768.74
  6. Step 6: Final answer
    x = 956.28

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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.