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Finding the Fourth Proportional to 906.39, 1,357.82 and 515.21

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Solution

The fourth proportional to 906.39, 1,357.82 and 515.21 is: 771.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.39 : 1,357.82 = 515.21 : x
  2. Step 2: Convert to fraction form
    906.39/1,357.82 = 515.21/x
  3. Step 3: Cross multiply
    906.39x = 1,357.82 × 515.21
  4. Step 4: Simplify right side
    906.39x = 699,567.12
  5. Step 5: Solve for x
    x = 699,567.12/906.39
  6. Step 6: Final answer
    x = 771.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.