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Finding the Fourth Proportional to 810.83, 1,118.90 and 571.92

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Solution

The fourth proportional to 810.83, 1,118.90 and 571.92 is: 789.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.83 : 1,118.90 = 571.92 : x
  2. Step 2: Convert to fraction form
    810.83/1,118.90 = 571.92/x
  3. Step 3: Cross multiply
    810.83x = 1,118.90 × 571.92
  4. Step 4: Simplify right side
    810.83x = 639,918.43
  5. Step 5: Solve for x
    x = 639,918.43/810.83
  6. Step 6: Final answer
    x = 789.22

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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.