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Finding the Fourth Proportional to 927.32, 1,280.21 and 717.03

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Solution

The fourth proportional to 927.32, 1,280.21 and 717.03 is: 989.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.32 : 1,280.21 = 717.03 : x
  2. Step 2: Convert to fraction form
    927.32/1,280.21 = 717.03/x
  3. Step 3: Cross multiply
    927.32x = 1,280.21 × 717.03
  4. Step 4: Simplify right side
    927.32x = 917,945.39
  5. Step 5: Solve for x
    x = 917,945.39/927.32
  6. Step 6: Final answer
    x = 989.90

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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.