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Finding the Fourth Proportional to 1,205.78, 1,808.67 and 628.52

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Solution

The fourth proportional to 1,205.78, 1,808.67 and 628.52 is: 942.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.78 : 1,808.67 = 628.52 : x
  2. Step 2: Convert to fraction form
    1,205.78/1,808.67 = 628.52/x
  3. Step 3: Cross multiply
    1,205.78x = 1,808.67 × 628.52
  4. Step 4: Simplify right side
    1,205.78x = 1,136,785.27
  5. Step 5: Solve for x
    x = 1,136,785.27/1,205.78
  6. Step 6: Final answer
    x = 942.78

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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.