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Finding the Fourth Proportional to 911.72, 1,368.39 and 522.11

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Solution

The fourth proportional to 911.72, 1,368.39 and 522.11 is: 783.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.72 : 1,368.39 = 522.11 : x
  2. Step 2: Convert to fraction form
    911.72/1,368.39 = 522.11/x
  3. Step 3: Cross multiply
    911.72x = 1,368.39 × 522.11
  4. Step 4: Simplify right side
    911.72x = 714,455.48
  5. Step 5: Solve for x
    x = 714,455.48/911.72
  6. Step 6: Final answer
    x = 783.63

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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.