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Finding the Fourth Proportional to 1,205.72, 1,808.61 and 512.52

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Solution

The fourth proportional to 1,205.72, 1,808.61 and 512.52 is: 768.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.72 : 1,808.61 = 512.52 : x
  2. Step 2: Convert to fraction form
    1,205.72/1,808.61 = 512.52/x
  3. Step 3: Cross multiply
    1,205.72x = 1,808.61 × 512.52
  4. Step 4: Simplify right side
    1,205.72x = 926,948.80
  5. Step 5: Solve for x
    x = 926,948.80/1,205.72
  6. Step 6: Final answer
    x = 768.79

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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.