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Finding the Fourth Proportional to 1,891.28, 2,837.30 and 658.78

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Solution

The fourth proportional to 1,891.28, 2,837.30 and 658.78 is: 988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,891.28 : 2,837.30 = 658.78 : x
  2. Step 2: Convert to fraction form
    1,891.28/2,837.30 = 658.78/x
  3. Step 3: Cross multiply
    1,891.28x = 2,837.30 × 658.78
  4. Step 4: Simplify right side
    1,891.28x = 1,869,157.98
  5. Step 5: Solve for x
    x = 1,869,157.98/1,891.28
  6. Step 6: Final answer
    x = 988.31

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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.