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Finding the Fourth Proportional to 1,291.98, 1,781.73 and 961.14

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Solution

The fourth proportional to 1,291.98, 1,781.73 and 961.14 is: 1,325.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.98 : 1,781.73 = 961.14 : x
  2. Step 2: Convert to fraction form
    1,291.98/1,781.73 = 961.14/x
  3. Step 3: Cross multiply
    1,291.98x = 1,781.73 × 961.14
  4. Step 4: Simplify right side
    1,291.98x = 1,712,491.97
  5. Step 5: Solve for x
    x = 1,712,491.97/1,291.98
  6. Step 6: Final answer
    x = 1,325.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.