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Finding the Fourth Proportional to 748.42, 1,122.66 and 382.72

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Solution

The fourth proportional to 748.42, 1,122.66 and 382.72 is: 574.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.42 : 1,122.66 = 382.72 : x
  2. Step 2: Convert to fraction form
    748.42/1,122.66 = 382.72/x
  3. Step 3: Cross multiply
    748.42x = 1,122.66 × 382.72
  4. Step 4: Simplify right side
    748.42x = 429,664.44
  5. Step 5: Solve for x
    x = 429,664.44/748.42
  6. Step 6: Final answer
    x = 574.10

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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.