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Finding the Fourth Proportional to 1,305.92, 1,961.16 and 1,125.92

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Solution

The fourth proportional to 1,305.92, 1,961.16 and 1,125.92 is: 1,690.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.92 : 1,961.16 = 1,125.92 : x
  2. Step 2: Convert to fraction form
    1,305.92/1,961.16 = 1,125.92/x
  3. Step 3: Cross multiply
    1,305.92x = 1,961.16 × 1,125.92
  4. Step 4: Simplify right side
    1,305.92x = 2,208,109.27
  5. Step 5: Solve for x
    x = 2,208,109.27/1,305.92
  6. Step 6: Final answer
    x = 1,690.85

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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.