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Finding the Fourth Proportional to 994.70, 1,372.88 and 635.56

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Solution

The fourth proportional to 994.70, 1,372.88 and 635.56 is: 877.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.70 : 1,372.88 = 635.56 : x
  2. Step 2: Convert to fraction form
    994.70/1,372.88 = 635.56/x
  3. Step 3: Cross multiply
    994.70x = 1,372.88 × 635.56
  4. Step 4: Simplify right side
    994.70x = 872,547.61
  5. Step 5: Solve for x
    x = 872,547.61/994.70
  6. Step 6: Final answer
    x = 877.20

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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.