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Finding the Fourth Proportional to 1,128.21, 1,692.06 and 387.73

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Solution

The fourth proportional to 1,128.21, 1,692.06 and 387.73 is: 581.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.21 : 1,692.06 = 387.73 : x
  2. Step 2: Convert to fraction form
    1,128.21/1,692.06 = 387.73/x
  3. Step 3: Cross multiply
    1,128.21x = 1,692.06 × 387.73
  4. Step 4: Simplify right side
    1,128.21x = 656,062.42
  5. Step 5: Solve for x
    x = 656,062.42/1,128.21
  6. Step 6: Final answer
    x = 581.51

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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.