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Finding the Fourth Proportional to 810.80, 1,119.26 and 591.42

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Solution

The fourth proportional to 810.80, 1,119.26 and 591.42 is: 816.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.80 : 1,119.26 = 591.42 : x
  2. Step 2: Convert to fraction form
    810.80/1,119.26 = 591.42/x
  3. Step 3: Cross multiply
    810.80x = 1,119.26 × 591.42
  4. Step 4: Simplify right side
    810.80x = 661,949.79
  5. Step 5: Solve for x
    x = 661,949.79/810.80
  6. Step 6: Final answer
    x = 816.42

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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.