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Finding the Fourth Proportional to 717.42, 1,074.50 and 428.26

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Solution

The fourth proportional to 717.42, 1,074.50 and 428.26 is: 641.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.42 : 1,074.50 = 428.26 : x
  2. Step 2: Convert to fraction form
    717.42/1,074.50 = 428.26/x
  3. Step 3: Cross multiply
    717.42x = 1,074.50 × 428.26
  4. Step 4: Simplify right side
    717.42x = 460,165.37
  5. Step 5: Solve for x
    x = 460,165.37/717.42
  6. Step 6: Final answer
    x = 641.42

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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.