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Finding the Fourth Proportional to 2,158.90, 3,238.39 and 678.09

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Solution

The fourth proportional to 2,158.90, 3,238.39 and 678.09 is: 1,017.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.90 : 3,238.39 = 678.09 : x
  2. Step 2: Convert to fraction form
    2,158.90/3,238.39 = 678.09/x
  3. Step 3: Cross multiply
    2,158.90x = 3,238.39 × 678.09
  4. Step 4: Simplify right side
    2,158.90x = 2,195,900.29
  5. Step 5: Solve for x
    x = 2,195,900.29/2,158.90
  6. Step 6: Final answer
    x = 1,017.14

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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.