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Finding the Fourth Proportional to 718.56, 996.66 and 689.40

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Solution

The fourth proportional to 718.56, 996.66 and 689.40 is: 956.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.56 : 996.66 = 689.40 : x
  2. Step 2: Convert to fraction form
    718.56/996.66 = 689.40/x
  3. Step 3: Cross multiply
    718.56x = 996.66 × 689.40
  4. Step 4: Simplify right side
    718.56x = 687,097.40
  5. Step 5: Solve for x
    x = 687,097.40/718.56
  6. Step 6: Final answer
    x = 956.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.