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Finding the Fourth Proportional to 768.19, 1,151.36 and 551.32

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Solution

The fourth proportional to 768.19, 1,151.36 and 551.32 is: 826.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.19 : 1,151.36 = 551.32 : x
  2. Step 2: Convert to fraction form
    768.19/1,151.36 = 551.32/x
  3. Step 3: Cross multiply
    768.19x = 1,151.36 × 551.32
  4. Step 4: Simplify right side
    768.19x = 634,765.04
  5. Step 5: Solve for x
    x = 634,765.04/768.19
  6. Step 6: Final answer
    x = 826.31

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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.