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Finding the Fourth Proportional to 809.81, 1,116.35 and 573.03

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Solution

The fourth proportional to 809.81, 1,116.35 and 573.03 is: 789.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.81 : 1,116.35 = 573.03 : x
  2. Step 2: Convert to fraction form
    809.81/1,116.35 = 573.03/x
  3. Step 3: Cross multiply
    809.81x = 1,116.35 × 573.03
  4. Step 4: Simplify right side
    809.81x = 639,698.18
  5. Step 5: Solve for x
    x = 639,698.18/809.81
  6. Step 6: Final answer
    x = 789.93

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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.