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Finding the Fourth Proportional to 2,140.24, 3,209.22 and 985

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Solution

The fourth proportional to 2,140.24, 3,209.22 and 985 is: 1,476.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,140.24 : 3,209.22 = 985 : x
  2. Step 2: Convert to fraction form
    2,140.24/3,209.22 = 985/x
  3. Step 3: Cross multiply
    2,140.24x = 3,209.22 × 985
  4. Step 4: Simplify right side
    2,140.24x = 3,161,081.70
  5. Step 5: Solve for x
    x = 3,161,081.70/2,140.24
  6. Step 6: Final answer
    x = 1,476.98

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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.