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Finding the Fourth Proportional to 939.08, 1,293.64 and 717.95

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Solution

The fourth proportional to 939.08, 1,293.64 and 717.95 is: 989.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.08 : 1,293.64 = 717.95 : x
  2. Step 2: Convert to fraction form
    939.08/1,293.64 = 717.95/x
  3. Step 3: Cross multiply
    939.08x = 1,293.64 × 717.95
  4. Step 4: Simplify right side
    939.08x = 928,770.28
  5. Step 5: Solve for x
    x = 928,770.28/939.08
  6. Step 6: Final answer
    x = 989.02

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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.