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Finding the Fourth Proportional to 778.98, 1,074.85 and 631.36

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Solution

The fourth proportional to 778.98, 1,074.85 and 631.36 is: 871.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.98 : 1,074.85 = 631.36 : x
  2. Step 2: Convert to fraction form
    778.98/1,074.85 = 631.36/x
  3. Step 3: Cross multiply
    778.98x = 1,074.85 × 631.36
  4. Step 4: Simplify right side
    778.98x = 678,617.30
  5. Step 5: Solve for x
    x = 678,617.30/778.98
  6. Step 6: Final answer
    x = 871.16

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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.