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Finding the Fourth Proportional to 994.10, 1,370.57 and 639.39

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Solution

The fourth proportional to 994.10, 1,370.57 and 639.39 is: 881.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.10 : 1,370.57 = 639.39 : x
  2. Step 2: Convert to fraction form
    994.10/1,370.57 = 639.39/x
  3. Step 3: Cross multiply
    994.10x = 1,370.57 × 639.39
  4. Step 4: Simplify right side
    994.10x = 876,320.42
  5. Step 5: Solve for x
    x = 876,320.42/994.10
  6. Step 6: Final answer
    x = 881.52

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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.