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Finding the Fourth Proportional to 718.11, 988.92 and 685.31

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Solution

The fourth proportional to 718.11, 988.92 and 685.31 is: 943.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.11 : 988.92 = 685.31 : x
  2. Step 2: Convert to fraction form
    718.11/988.92 = 685.31/x
  3. Step 3: Cross multiply
    718.11x = 988.92 × 685.31
  4. Step 4: Simplify right side
    718.11x = 677,711.82
  5. Step 5: Solve for x
    x = 677,711.82/718.11
  6. Step 6: Final answer
    x = 943.74

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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.