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Finding the Fourth Proportional to 1,285.52, 1,928.36 and 516

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Solution

The fourth proportional to 1,285.52, 1,928.36 and 516 is: 774.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.52 : 1,928.36 = 516 : x
  2. Step 2: Convert to fraction form
    1,285.52/1,928.36 = 516/x
  3. Step 3: Cross multiply
    1,285.52x = 1,928.36 × 516
  4. Step 4: Simplify right side
    1,285.52x = 995,033.76
  5. Step 5: Solve for x
    x = 995,033.76/1,285.52
  6. Step 6: Final answer
    x = 774.03

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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.