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Finding the Fourth Proportional to 927.08, 1,278.96 and 717.32

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Solution

The fourth proportional to 927.08, 1,278.96 and 717.32 is: 989.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.08 : 1,278.96 = 717.32 : x
  2. Step 2: Convert to fraction form
    927.08/1,278.96 = 717.32/x
  3. Step 3: Cross multiply
    927.08x = 1,278.96 × 717.32
  4. Step 4: Simplify right side
    927.08x = 917,423.59
  5. Step 5: Solve for x
    x = 917,423.59/927.08
  6. Step 6: Final answer
    x = 989.58

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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.