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Finding the Fourth Proportional to 2,692.80, 4,039.20 and 961.08

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Solution

The fourth proportional to 2,692.80, 4,039.20 and 961.08 is: 1,441.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,692.80 : 4,039.20 = 961.08 : x
  2. Step 2: Convert to fraction form
    2,692.80/4,039.20 = 961.08/x
  3. Step 3: Cross multiply
    2,692.80x = 4,039.20 × 961.08
  4. Step 4: Simplify right side
    2,692.80x = 3,881,994.34
  5. Step 5: Solve for x
    x = 3,881,994.34/2,692.80
  6. Step 6: Final answer
    x = 1,441.62

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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.