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Finding the Fourth Proportional to 1,227.65, 1,692.15 and 961.65

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Solution

The fourth proportional to 1,227.65, 1,692.15 and 961.65 is: 1,325.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,227.65 : 1,692.15 = 961.65 : x
  2. Step 2: Convert to fraction form
    1,227.65/1,692.15 = 961.65/x
  3. Step 3: Cross multiply
    1,227.65x = 1,692.15 × 961.65
  4. Step 4: Simplify right side
    1,227.65x = 1,627,256.05
  5. Step 5: Solve for x
    x = 1,627,256.05/1,227.65
  6. Step 6: Final answer
    x = 1,325.51

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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.