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Finding the Fourth Proportional to 1,990.52, 2,986 and 691.70

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Solution

The fourth proportional to 1,990.52, 2,986 and 691.70 is: 1,037.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.52 : 2,986 = 691.70 : x
  2. Step 2: Convert to fraction form
    1,990.52/2,986 = 691.70/x
  3. Step 3: Cross multiply
    1,990.52x = 2,986 × 691.70
  4. Step 4: Simplify right side
    1,990.52x = 2,065,416.20
  5. Step 5: Solve for x
    x = 2,065,416.20/1,990.52
  6. Step 6: Final answer
    x = 1,037.63

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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.