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Finding the Fourth Proportional to 805.85, 1,111.52 and 717.91

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Solution

The fourth proportional to 805.85, 1,111.52 and 717.91 is: 990.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.85 : 1,111.52 = 717.91 : x
  2. Step 2: Convert to fraction form
    805.85/1,111.52 = 717.91/x
  3. Step 3: Cross multiply
    805.85x = 1,111.52 × 717.91
  4. Step 4: Simplify right side
    805.85x = 797,976.59
  5. Step 5: Solve for x
    x = 797,976.59/805.85
  6. Step 6: Final answer
    x = 990.23

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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.