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Finding the Fourth Proportional to 1,694.91, 2,338.91 and 986.78

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Solution

The fourth proportional to 1,694.91, 2,338.91 and 986.78 is: 1,361.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,694.91 : 2,338.91 = 986.78 : x
  2. Step 2: Convert to fraction form
    1,694.91/2,338.91 = 986.78/x
  3. Step 3: Cross multiply
    1,694.91x = 2,338.91 × 986.78
  4. Step 4: Simplify right side
    1,694.91x = 2,307,989.61
  5. Step 5: Solve for x
    x = 2,307,989.61/1,694.91
  6. Step 6: Final answer
    x = 1,361.72

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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.