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Finding the Fourth Proportional to 778.22, 1,073.87 and 631.21

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Solution

The fourth proportional to 778.22, 1,073.87 and 631.21 is: 871.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.22 : 1,073.87 = 631.21 : x
  2. Step 2: Convert to fraction form
    778.22/1,073.87 = 631.21/x
  3. Step 3: Cross multiply
    778.22x = 1,073.87 × 631.21
  4. Step 4: Simplify right side
    778.22x = 677,837.48
  5. Step 5: Solve for x
    x = 677,837.48/778.22
  6. Step 6: Final answer
    x = 871.01

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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.