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Finding the Fourth Proportional to 1,074.28, 1,611.42 and 663.56

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Solution

The fourth proportional to 1,074.28, 1,611.42 and 663.56 is: 995.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.28 : 1,611.42 = 663.56 : x
  2. Step 2: Convert to fraction form
    1,074.28/1,611.42 = 663.56/x
  3. Step 3: Cross multiply
    1,074.28x = 1,611.42 × 663.56
  4. Step 4: Simplify right side
    1,074.28x = 1,069,271.22
  5. Step 5: Solve for x
    x = 1,069,271.22/1,074.28
  6. Step 6: Final answer
    x = 995.34

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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.