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Finding the Fourth Proportional to 772.78, 1,065.33 and 551.65

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Solution

The fourth proportional to 772.78, 1,065.33 and 551.65 is: 760.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.78 : 1,065.33 = 551.65 : x
  2. Step 2: Convert to fraction form
    772.78/1,065.33 = 551.65/x
  3. Step 3: Cross multiply
    772.78x = 1,065.33 × 551.65
  4. Step 4: Simplify right side
    772.78x = 587,689.29
  5. Step 5: Solve for x
    x = 587,689.29/772.78
  6. Step 6: Final answer
    x = 760.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.