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Finding the Fourth Proportional to 927.09, 1,278.18 and 717.57

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Solution

The fourth proportional to 927.09, 1,278.18 and 717.57 is: 989.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.09 : 1,278.18 = 717.57 : x
  2. Step 2: Convert to fraction form
    927.09/1,278.18 = 717.57/x
  3. Step 3: Cross multiply
    927.09x = 1,278.18 × 717.57
  4. Step 4: Simplify right side
    927.09x = 917,183.62
  5. Step 5: Solve for x
    x = 917,183.62/927.09
  6. Step 6: Final answer
    x = 989.31

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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.