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Finding the Fourth Proportional to 2,158.45, 3,235.49 and 841.38

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Solution

The fourth proportional to 2,158.45, 3,235.49 and 841.38 is: 1,261.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.45 : 3,235.49 = 841.38 : x
  2. Step 2: Convert to fraction form
    2,158.45/3,235.49 = 841.38/x
  3. Step 3: Cross multiply
    2,158.45x = 3,235.49 × 841.38
  4. Step 4: Simplify right side
    2,158.45x = 2,722,260.40
  5. Step 5: Solve for x
    x = 2,722,260.40/2,158.45
  6. Step 6: Final answer
    x = 1,261.21

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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.