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Finding the Fourth Proportional to 3,891.99, 5,371.05 and 2,123.70

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Solution

The fourth proportional to 3,891.99, 5,371.05 and 2,123.70 is: 2,930.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.99 : 5,371.05 = 2,123.70 : x
  2. Step 2: Convert to fraction form
    3,891.99/5,371.05 = 2,123.70/x
  3. Step 3: Cross multiply
    3,891.99x = 5,371.05 × 2,123.70
  4. Step 4: Simplify right side
    3,891.99x = 11,406,498.89
  5. Step 5: Solve for x
    x = 11,406,498.89/3,891.99
  6. Step 6: Final answer
    x = 2,930.76

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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.