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Finding the Fourth Proportional to 908.39, 1,253.36 and 722.49

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Solution

The fourth proportional to 908.39, 1,253.36 and 722.49 is: 996.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.39 : 1,253.36 = 722.49 : x
  2. Step 2: Convert to fraction form
    908.39/1,253.36 = 722.49/x
  3. Step 3: Cross multiply
    908.39x = 1,253.36 × 722.49
  4. Step 4: Simplify right side
    908.39x = 905,536.45
  5. Step 5: Solve for x
    x = 905,536.45/908.39
  6. Step 6: Final answer
    x = 996.86

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Double scale
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1.5x scale

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.