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Finding the Fourth Proportional to 911.48, 1,366.18 and 391.22

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Solution

The fourth proportional to 911.48, 1,366.18 and 391.22 is: 586.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.48 : 1,366.18 = 391.22 : x
  2. Step 2: Convert to fraction form
    911.48/1,366.18 = 391.22/x
  3. Step 3: Cross multiply
    911.48x = 1,366.18 × 391.22
  4. Step 4: Simplify right side
    911.48x = 534,476.94
  5. Step 5: Solve for x
    x = 534,476.94/911.48
  6. Step 6: Final answer
    x = 586.38

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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.