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Finding the Fourth Proportional to 816.25, 1,126.56 and 641.29

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Solution

The fourth proportional to 816.25, 1,126.56 and 641.29 is: 885.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.25 : 1,126.56 = 641.29 : x
  2. Step 2: Convert to fraction form
    816.25/1,126.56 = 641.29/x
  3. Step 3: Cross multiply
    816.25x = 1,126.56 × 641.29
  4. Step 4: Simplify right side
    816.25x = 722,451.66
  5. Step 5: Solve for x
    x = 722,451.66/816.25
  6. Step 6: Final answer
    x = 885.09

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1.5x scale

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.