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Finding the Fourth Proportional to 743.82, 1,114.53 and 640.62

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Solution

The fourth proportional to 743.82, 1,114.53 and 640.62 is: 959.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.82 : 1,114.53 = 640.62 : x
  2. Step 2: Convert to fraction form
    743.82/1,114.53 = 640.62/x
  3. Step 3: Cross multiply
    743.82x = 1,114.53 × 640.62
  4. Step 4: Simplify right side
    743.82x = 713,990.21
  5. Step 5: Solve for x
    x = 713,990.21/743.82
  6. Step 6: Final answer
    x = 959.90

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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.