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Finding the Fourth Proportional to 1,961.92, 2,942.79 and 575.20

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Solution

The fourth proportional to 1,961.92, 2,942.79 and 575.20 is: 862.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,961.92 : 2,942.79 = 575.20 : x
  2. Step 2: Convert to fraction form
    1,961.92/2,942.79 = 575.20/x
  3. Step 3: Cross multiply
    1,961.92x = 2,942.79 × 575.20
  4. Step 4: Simplify right side
    1,961.92x = 1,692,692.81
  5. Step 5: Solve for x
    x = 1,692,692.81/1,961.92
  6. Step 6: Final answer
    x = 862.77

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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.