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Finding the Fourth Proportional to 772.64, 1,065.86 and 717.05

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Solution

The fourth proportional to 772.64, 1,065.86 and 717.05 is: 989.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.64 : 1,065.86 = 717.05 : x
  2. Step 2: Convert to fraction form
    772.64/1,065.86 = 717.05/x
  3. Step 3: Cross multiply
    772.64x = 1,065.86 × 717.05
  4. Step 4: Simplify right side
    772.64x = 764,276.68
  5. Step 5: Solve for x
    x = 764,276.68/772.64
  6. Step 6: Final answer
    x = 989.18

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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.