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Finding the Fourth Proportional to 1,074.20, 1,611.36 and 343.98

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Solution

The fourth proportional to 1,074.20, 1,611.36 and 343.98 is: 515.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.20 : 1,611.36 = 343.98 : x
  2. Step 2: Convert to fraction form
    1,074.20/1,611.36 = 343.98/x
  3. Step 3: Cross multiply
    1,074.20x = 1,611.36 × 343.98
  4. Step 4: Simplify right side
    1,074.20x = 554,275.61
  5. Step 5: Solve for x
    x = 554,275.61/1,074.20
  6. Step 6: Final answer
    x = 515.99

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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.