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Finding the Fourth Proportional to 2,158.55, 3,234.87 and 987.09

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Solution

The fourth proportional to 2,158.55, 3,234.87 and 987.09 is: 1,479.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.55 : 3,234.87 = 987.09 : x
  2. Step 2: Convert to fraction form
    2,158.55/3,234.87 = 987.09/x
  3. Step 3: Cross multiply
    2,158.55x = 3,234.87 × 987.09
  4. Step 4: Simplify right side
    2,158.55x = 3,193,107.83
  5. Step 5: Solve for x
    x = 3,193,107.83/2,158.55
  6. Step 6: Final answer
    x = 1,479.29

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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.