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Finding the Fourth Proportional to 874.48, 1,205.92 and 639.04

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Solution

The fourth proportional to 874.48, 1,205.92 and 639.04 is: 881.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.48 : 1,205.92 = 639.04 : x
  2. Step 2: Convert to fraction form
    874.48/1,205.92 = 639.04/x
  3. Step 3: Cross multiply
    874.48x = 1,205.92 × 639.04
  4. Step 4: Simplify right side
    874.48x = 770,631.12
  5. Step 5: Solve for x
    x = 770,631.12/874.48
  6. Step 6: Final answer
    x = 881.24

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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.