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Finding the Fourth Proportional to 718.27, 990.38 and 679.34

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Solution

The fourth proportional to 718.27, 990.38 and 679.34 is: 936.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.27 : 990.38 = 679.34 : x
  2. Step 2: Convert to fraction form
    718.27/990.38 = 679.34/x
  3. Step 3: Cross multiply
    718.27x = 990.38 × 679.34
  4. Step 4: Simplify right side
    718.27x = 672,799.53
  5. Step 5: Solve for x
    x = 672,799.53/718.27
  6. Step 6: Final answer
    x = 936.70

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1.5x scale

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.