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Finding the Fourth Proportional to 939.24, 1,294.18 and 718.44

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Solution

The fourth proportional to 939.24, 1,294.18 and 718.44 is: 989.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.24 : 1,294.18 = 718.44 : x
  2. Step 2: Convert to fraction form
    939.24/1,294.18 = 718.44/x
  3. Step 3: Cross multiply
    939.24x = 1,294.18 × 718.44
  4. Step 4: Simplify right side
    939.24x = 929,790.68
  5. Step 5: Solve for x
    x = 929,790.68/939.24
  6. Step 6: Final answer
    x = 989.94

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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.