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Finding the Fourth Proportional to 767.20, 1,149.72 and 551.20

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Solution

The fourth proportional to 767.20, 1,149.72 and 551.20 is: 826.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.20 : 1,149.72 = 551.20 : x
  2. Step 2: Convert to fraction form
    767.20/1,149.72 = 551.20/x
  3. Step 3: Cross multiply
    767.20x = 1,149.72 × 551.20
  4. Step 4: Simplify right side
    767.20x = 633,725.66
  5. Step 5: Solve for x
    x = 633,725.66/767.20
  6. Step 6: Final answer
    x = 826.02

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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.