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Finding the Fourth Proportional to 3,891.56, 5,370.42 and 2,123.18

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Solution

The fourth proportional to 3,891.56, 5,370.42 and 2,123.18 is: 2,930.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.56 : 5,370.42 = 2,123.18 : x
  2. Step 2: Convert to fraction form
    3,891.56/5,370.42 = 2,123.18/x
  3. Step 3: Cross multiply
    3,891.56x = 5,370.42 × 2,123.18
  4. Step 4: Simplify right side
    3,891.56x = 11,402,368.34
  5. Step 5: Solve for x
    x = 11,402,368.34/3,891.56
  6. Step 6: Final answer
    x = 2,930.03

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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.