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Finding the Fourth Proportional to 2,005.81, 3,008.08 and 689.25

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Solution

The fourth proportional to 2,005.81, 3,008.08 and 689.25 is: 1,033.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,005.81 : 3,008.08 = 689.25 : x
  2. Step 2: Convert to fraction form
    2,005.81/3,008.08 = 689.25/x
  3. Step 3: Cross multiply
    2,005.81x = 3,008.08 × 689.25
  4. Step 4: Simplify right side
    2,005.81x = 2,073,318.12
  5. Step 5: Solve for x
    x = 2,073,318.12/2,005.81
  6. Step 6: Final answer
    x = 1,033.65

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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.