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Finding the Fourth Proportional to 2,158.40, 3,230.40 and 1,899.20

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Solution

The fourth proportional to 2,158.40, 3,230.40 and 1,899.20 is: 2,842.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.40 : 3,230.40 = 1,899.20 : x
  2. Step 2: Convert to fraction form
    2,158.40/3,230.40 = 1,899.20/x
  3. Step 3: Cross multiply
    2,158.40x = 3,230.40 × 1,899.20
  4. Step 4: Simplify right side
    2,158.40x = 6,135,175.68
  5. Step 5: Solve for x
    x = 6,135,175.68/2,158.40
  6. Step 6: Final answer
    x = 2,842.46

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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.