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Finding the Fourth Proportional to 2,390.40, 3,578.40 and 2,131.20

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Solution

The fourth proportional to 2,390.40, 3,578.40 and 2,131.20 is: 3,190.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.40 : 3,578.40 = 2,131.20 : x
  2. Step 2: Convert to fraction form
    2,390.40/3,578.40 = 2,131.20/x
  3. Step 3: Cross multiply
    2,390.40x = 3,578.40 × 2,131.20
  4. Step 4: Simplify right side
    2,390.40x = 7,626,286.08
  5. Step 5: Solve for x
    x = 7,626,286.08/2,390.40
  6. Step 6: Final answer
    x = 3,190.38

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1.5x scale

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.