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Finding the Fourth Proportional to 997.83, 1,375.86 and 810.74

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Solution

The fourth proportional to 997.83, 1,375.86 and 810.74 is: 1,117.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.83 : 1,375.86 = 810.74 : x
  2. Step 2: Convert to fraction form
    997.83/1,375.86 = 810.74/x
  3. Step 3: Cross multiply
    997.83x = 1,375.86 × 810.74
  4. Step 4: Simplify right side
    997.83x = 1,115,464.74
  5. Step 5: Solve for x
    x = 1,115,464.74/997.83
  6. Step 6: Final answer
    x = 1,117.89

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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.