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Finding the Fourth Proportional to 1,235.76, 1,855.14 and 961.44

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Solution

The fourth proportional to 1,235.76, 1,855.14 and 961.44 is: 1,443.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.76 : 1,855.14 = 961.44 : x
  2. Step 2: Convert to fraction form
    1,235.76/1,855.14 = 961.44/x
  3. Step 3: Cross multiply
    1,235.76x = 1,855.14 × 961.44
  4. Step 4: Simplify right side
    1,235.76x = 1,783,605.80
  5. Step 5: Solve for x
    x = 1,783,605.80/1,235.76
  6. Step 6: Final answer
    x = 1,443.33

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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.