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Finding the Fourth Proportional to 969.56, 1,336.50 and 772.76

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Solution

The fourth proportional to 969.56, 1,336.50 and 772.76 is: 1,065.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.56 : 1,336.50 = 772.76 : x
  2. Step 2: Convert to fraction form
    969.56/1,336.50 = 772.76/x
  3. Step 3: Cross multiply
    969.56x = 1,336.50 × 772.76
  4. Step 4: Simplify right side
    969.56x = 1,032,793.74
  5. Step 5: Solve for x
    x = 1,032,793.74/969.56
  6. Step 6: Final answer
    x = 1,065.22

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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.