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Finding the Fourth Proportional to 911.97, 1,368.19 and 424.45

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Solution

The fourth proportional to 911.97, 1,368.19 and 424.45 is: 636.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.97 : 1,368.19 = 424.45 : x
  2. Step 2: Convert to fraction form
    911.97/1,368.19 = 424.45/x
  3. Step 3: Cross multiply
    911.97x = 1,368.19 × 424.45
  4. Step 4: Simplify right side
    911.97x = 580,728.25
  5. Step 5: Solve for x
    x = 580,728.25/911.97
  6. Step 6: Final answer
    x = 636.78

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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.