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Finding the Fourth Proportional to 1,691.87, 2,334.78 and 983.88

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Solution

The fourth proportional to 1,691.87, 2,334.78 and 983.88 is: 1,357.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,691.87 : 2,334.78 = 983.88 : x
  2. Step 2: Convert to fraction form
    1,691.87/2,334.78 = 983.88/x
  3. Step 3: Cross multiply
    1,691.87x = 2,334.78 × 983.88
  4. Step 4: Simplify right side
    1,691.87x = 2,297,143.35
  5. Step 5: Solve for x
    x = 2,297,143.35/1,691.87
  6. Step 6: Final answer
    x = 1,357.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.