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Finding the Fourth Proportional to 918.11, 1,266.68 and 519.72

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Solution

The fourth proportional to 918.11, 1,266.68 and 519.72 is: 717.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.11 : 1,266.68 = 519.72 : x
  2. Step 2: Convert to fraction form
    918.11/1,266.68 = 519.72/x
  3. Step 3: Cross multiply
    918.11x = 1,266.68 × 519.72
  4. Step 4: Simplify right side
    918.11x = 658,316.33
  5. Step 5: Solve for x
    x = 658,316.33/918.11
  6. Step 6: Final answer
    x = 717.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.