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Finding the Fourth Proportional to 743.53, 1,115.37 and 378.09

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Solution

The fourth proportional to 743.53, 1,115.37 and 378.09 is: 567.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.53 : 1,115.37 = 378.09 : x
  2. Step 2: Convert to fraction form
    743.53/1,115.37 = 378.09/x
  3. Step 3: Cross multiply
    743.53x = 1,115.37 × 378.09
  4. Step 4: Simplify right side
    743.53x = 421,710.24
  5. Step 5: Solve for x
    x = 421,710.24/743.53
  6. Step 6: Final answer
    x = 567.17

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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.