Home / 3,891.65-5,370.50-2,123.21

Finding the Fourth Proportional to 3,891.65, 5,370.50 and 2,123.21

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Solution

The fourth proportional to 3,891.65, 5,370.50 and 2,123.21 is: 2,930.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.65 : 5,370.50 = 2,123.21 : x
  2. Step 2: Convert to fraction form
    3,891.65/5,370.50 = 2,123.21/x
  3. Step 3: Cross multiply
    3,891.65x = 5,370.50 × 2,123.21
  4. Step 4: Simplify right side
    3,891.65x = 11,402,718.04
  5. Step 5: Solve for x
    x = 11,402,718.04/3,891.65
  6. Step 6: Final answer
    x = 2,930.05

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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.