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Finding the Fourth Proportional to 906.85, 1,251.45 and 513.95

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Solution

The fourth proportional to 906.85, 1,251.45 and 513.95 is: 709.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.85 : 1,251.45 = 513.95 : x
  2. Step 2: Convert to fraction form
    906.85/1,251.45 = 513.95/x
  3. Step 3: Cross multiply
    906.85x = 1,251.45 × 513.95
  4. Step 4: Simplify right side
    906.85x = 643,182.73
  5. Step 5: Solve for x
    x = 643,182.73/906.85
  6. Step 6: Final answer
    x = 709.25

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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.