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Finding the Fourth Proportional to 997.10, 1,375.96 and 555.01

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Solution

The fourth proportional to 997.10, 1,375.96 and 555.01 is: 765.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.10 : 1,375.96 = 555.01 : x
  2. Step 2: Convert to fraction form
    997.10/1,375.96 = 555.01/x
  3. Step 3: Cross multiply
    997.10x = 1,375.96 × 555.01
  4. Step 4: Simplify right side
    997.10x = 763,671.56
  5. Step 5: Solve for x
    x = 763,671.56/997.10
  6. Step 6: Final answer
    x = 765.90

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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.