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Finding the Fourth Proportional to 1,074.42, 1,611.71 and 425

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Solution

The fourth proportional to 1,074.42, 1,611.71 and 425 is: 637.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.42 : 1,611.71 = 425 : x
  2. Step 2: Convert to fraction form
    1,074.42/1,611.71 = 425/x
  3. Step 3: Cross multiply
    1,074.42x = 1,611.71 × 425
  4. Step 4: Simplify right side
    1,074.42x = 684,976.75
  5. Step 5: Solve for x
    x = 684,976.75/1,074.42
  6. Step 6: Final answer
    x = 637.53

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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.