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Finding the Fourth Proportional to 818.91, 1,131.08 and 713.66

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Solution

The fourth proportional to 818.91, 1,131.08 and 713.66 is: 985.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.91 : 1,131.08 = 713.66 : x
  2. Step 2: Convert to fraction form
    818.91/1,131.08 = 713.66/x
  3. Step 3: Cross multiply
    818.91x = 1,131.08 × 713.66
  4. Step 4: Simplify right side
    818.91x = 807,197.33
  5. Step 5: Solve for x
    x = 807,197.33/818.91
  6. Step 6: Final answer
    x = 985.70

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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.