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Finding the Fourth Proportional to 808.56, 1,116.60 and 691.44

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Solution

The fourth proportional to 808.56, 1,116.60 and 691.44 is: 954.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.56 : 1,116.60 = 691.44 : x
  2. Step 2: Convert to fraction form
    808.56/1,116.60 = 691.44/x
  3. Step 3: Cross multiply
    808.56x = 1,116.60 × 691.44
  4. Step 4: Simplify right side
    808.56x = 772,061.90
  5. Step 5: Solve for x
    x = 772,061.90/808.56
  6. Step 6: Final answer
    x = 954.86

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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.