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Finding the Fourth Proportional to 743.72, 1,115.16 and 378.84

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Solution

The fourth proportional to 743.72, 1,115.16 and 378.84 is: 568.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.72 : 1,115.16 = 378.84 : x
  2. Step 2: Convert to fraction form
    743.72/1,115.16 = 378.84/x
  3. Step 3: Cross multiply
    743.72x = 1,115.16 × 378.84
  4. Step 4: Simplify right side
    743.72x = 422,467.21
  5. Step 5: Solve for x
    x = 422,467.21/743.72
  6. Step 6: Final answer
    x = 568.05

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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.