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Finding the Fourth Proportional to 991.17, 1,486.76 and 961.09

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Solution

The fourth proportional to 991.17, 1,486.76 and 961.09 is: 1,441.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.17 : 1,486.76 = 961.09 : x
  2. Step 2: Convert to fraction form
    991.17/1,486.76 = 961.09/x
  3. Step 3: Cross multiply
    991.17x = 1,486.76 × 961.09
  4. Step 4: Simplify right side
    991.17x = 1,428,910.17
  5. Step 5: Solve for x
    x = 1,428,910.17/991.17
  6. Step 6: Final answer
    x = 1,441.64

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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.