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Finding the Fourth Proportional to 906.43, 1,250.91 and 513.49

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Solution

The fourth proportional to 906.43, 1,250.91 and 513.49 is: 708.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.43 : 1,250.91 = 513.49 : x
  2. Step 2: Convert to fraction form
    906.43/1,250.91 = 513.49/x
  3. Step 3: Cross multiply
    906.43x = 1,250.91 × 513.49
  4. Step 4: Simplify right side
    906.43x = 642,329.78
  5. Step 5: Solve for x
    x = 642,329.78/906.43
  6. Step 6: Final answer
    x = 708.64

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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.