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Finding the Fourth Proportional to 809.93, 1,116.15 and 560.79

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Solution

The fourth proportional to 809.93, 1,116.15 and 560.79 is: 772.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.93 : 1,116.15 = 560.79 : x
  2. Step 2: Convert to fraction form
    809.93/1,116.15 = 560.79/x
  3. Step 3: Cross multiply
    809.93x = 1,116.15 × 560.79
  4. Step 4: Simplify right side
    809.93x = 625,917.37
  5. Step 5: Solve for x
    x = 625,917.37/809.93
  6. Step 6: Final answer
    x = 772.81

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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.