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Finding the Fourth Proportional to 809.99, 1,118.30 and 561.22

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Solution

The fourth proportional to 809.99, 1,118.30 and 561.22 is: 774.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.99 : 1,118.30 = 561.22 : x
  2. Step 2: Convert to fraction form
    809.99/1,118.30 = 561.22/x
  3. Step 3: Cross multiply
    809.99x = 1,118.30 × 561.22
  4. Step 4: Simplify right side
    809.99x = 627,609.52
  5. Step 5: Solve for x
    x = 627,609.52/809.99
  6. Step 6: Final answer
    x = 774.84

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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.