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Finding the Fourth Proportional to 743.91, 1,114.17 and 640.37

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Solution

The fourth proportional to 743.91, 1,114.17 and 640.37 is: 959.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.91 : 1,114.17 = 640.37 : x
  2. Step 2: Convert to fraction form
    743.91/1,114.17 = 640.37/x
  3. Step 3: Cross multiply
    743.91x = 1,114.17 × 640.37
  4. Step 4: Simplify right side
    743.91x = 713,473.87
  5. Step 5: Solve for x
    x = 713,473.87/743.91
  6. Step 6: Final answer
    x = 959.09

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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.