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Finding the Fourth Proportional to 1,103.62, 1,661.99 and 961.06

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Solution

The fourth proportional to 1,103.62, 1,661.99 and 961.06 is: 1,447.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.62 : 1,661.99 = 961.06 : x
  2. Step 2: Convert to fraction form
    1,103.62/1,661.99 = 961.06/x
  3. Step 3: Cross multiply
    1,103.62x = 1,661.99 × 961.06
  4. Step 4: Simplify right side
    1,103.62x = 1,597,272.11
  5. Step 5: Solve for x
    x = 1,597,272.11/1,103.62
  6. Step 6: Final answer
    x = 1,447.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.