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Finding the Fourth Proportional to 906.88, 1,251.30 and 513.76

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Solution

The fourth proportional to 906.88, 1,251.30 and 513.76 is: 708.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.88 : 1,251.30 = 513.76 : x
  2. Step 2: Convert to fraction form
    906.88/1,251.30 = 513.76/x
  3. Step 3: Cross multiply
    906.88x = 1,251.30 × 513.76
  4. Step 4: Simplify right side
    906.88x = 642,867.89
  5. Step 5: Solve for x
    x = 642,867.89/906.88
  6. Step 6: Final answer
    x = 708.88

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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.