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Finding the Fourth Proportional to 908.11, 1,253.28 and 535.21

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Solution

The fourth proportional to 908.11, 1,253.28 and 535.21 is: 738.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.11 : 1,253.28 = 535.21 : x
  2. Step 2: Convert to fraction form
    908.11/1,253.28 = 535.21/x
  3. Step 3: Cross multiply
    908.11x = 1,253.28 × 535.21
  4. Step 4: Simplify right side
    908.11x = 670,764.86
  5. Step 5: Solve for x
    x = 670,764.86/908.11
  6. Step 6: Final answer
    x = 738.64

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Double scale
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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.