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Finding the Fourth Proportional to 738.42, 1,019.10 and 423.78

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Solution

The fourth proportional to 738.42, 1,019.10 and 423.78 is: 584.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.42 : 1,019.10 = 423.78 : x
  2. Step 2: Convert to fraction form
    738.42/1,019.10 = 423.78/x
  3. Step 3: Cross multiply
    738.42x = 1,019.10 × 423.78
  4. Step 4: Simplify right side
    738.42x = 431,874.20
  5. Step 5: Solve for x
    x = 431,874.20/738.42
  6. Step 6: Final answer
    x = 584.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.