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Finding the Fourth Proportional to 911.49, 1,367.91 and 500.21

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Solution

The fourth proportional to 911.49, 1,367.91 and 500.21 is: 750.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.49 : 1,367.91 = 500.21 : x
  2. Step 2: Convert to fraction form
    911.49/1,367.91 = 500.21/x
  3. Step 3: Cross multiply
    911.49x = 1,367.91 × 500.21
  4. Step 4: Simplify right side
    911.49x = 684,235.42
  5. Step 5: Solve for x
    x = 684,235.42/911.49
  6. Step 6: Final answer
    x = 750.68

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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.