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Finding the Fourth Proportional to 1,819.89, 2,511.45 and 991.89

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Solution

The fourth proportional to 1,819.89, 2,511.45 and 991.89 is: 1,368.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,819.89 : 2,511.45 = 991.89 : x
  2. Step 2: Convert to fraction form
    1,819.89/2,511.45 = 991.89/x
  3. Step 3: Cross multiply
    1,819.89x = 2,511.45 × 991.89
  4. Step 4: Simplify right side
    1,819.89x = 2,491,082.14
  5. Step 5: Solve for x
    x = 2,491,082.14/1,819.89
  6. Step 6: Final answer
    x = 1,368.81

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1.5x scale

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.