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Finding the Fourth Proportional to 969.17, 1,451.39 and 772.81

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Solution

The fourth proportional to 969.17, 1,451.39 and 772.81 is: 1,157.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.17 : 1,451.39 = 772.81 : x
  2. Step 2: Convert to fraction form
    969.17/1,451.39 = 772.81/x
  3. Step 3: Cross multiply
    969.17x = 1,451.39 × 772.81
  4. Step 4: Simplify right side
    969.17x = 1,121,641.21
  5. Step 5: Solve for x
    x = 1,121,641.21/969.17
  6. Step 6: Final answer
    x = 1,157.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.