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Finding the Fourth Proportional to 772.25, 1,158.42 and 443.10

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Solution

The fourth proportional to 772.25, 1,158.42 and 443.10 is: 664.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.25 : 1,158.42 = 443.10 : x
  2. Step 2: Convert to fraction form
    772.25/1,158.42 = 443.10/x
  3. Step 3: Cross multiply
    772.25x = 1,158.42 × 443.10
  4. Step 4: Simplify right side
    772.25x = 513,298.80
  5. Step 5: Solve for x
    x = 513,298.80/772.25
  6. Step 6: Final answer
    x = 664.68

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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.