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Finding the Fourth Proportional to 809.63, 1,115.04 and 767.91

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Solution

The fourth proportional to 809.63, 1,115.04 and 767.91 is: 1,057.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.63 : 1,115.04 = 767.91 : x
  2. Step 2: Convert to fraction form
    809.63/1,115.04 = 767.91/x
  3. Step 3: Cross multiply
    809.63x = 1,115.04 × 767.91
  4. Step 4: Simplify right side
    809.63x = 856,250.37
  5. Step 5: Solve for x
    x = 856,250.37/809.63
  6. Step 6: Final answer
    x = 1,057.59

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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.