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Finding the Fourth Proportional to 808.62, 1,115.91 and 572.97

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Solution

The fourth proportional to 808.62, 1,115.91 and 572.97 is: 790.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.62 : 1,115.91 = 572.97 : x
  2. Step 2: Convert to fraction form
    808.62/1,115.91 = 572.97/x
  3. Step 3: Cross multiply
    808.62x = 1,115.91 × 572.97
  4. Step 4: Simplify right side
    808.62x = 639,382.95
  5. Step 5: Solve for x
    x = 639,382.95/808.62
  6. Step 6: Final answer
    x = 790.71

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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.