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Finding the Fourth Proportional to 813.09, 1,122.09 and 616.26

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Solution

The fourth proportional to 813.09, 1,122.09 and 616.26 is: 850.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.09 : 1,122.09 = 616.26 : x
  2. Step 2: Convert to fraction form
    813.09/1,122.09 = 616.26/x
  3. Step 3: Cross multiply
    813.09x = 1,122.09 × 616.26
  4. Step 4: Simplify right side
    813.09x = 691,499.18
  5. Step 5: Solve for x
    x = 691,499.18/813.09
  6. Step 6: Final answer
    x = 850.46

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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.