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Finding the Fourth Proportional to 1,128.25, 1,692.57 and 387.83

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Solution

The fourth proportional to 1,128.25, 1,692.57 and 387.83 is: 581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.25 : 1,692.57 = 387.83 : x
  2. Step 2: Convert to fraction form
    1,128.25/1,692.57 = 387.83/x
  3. Step 3: Cross multiply
    1,128.25x = 1,692.57 × 387.83
  4. Step 4: Simplify right side
    1,128.25x = 656,419.02
  5. Step 5: Solve for x
    x = 656,419.02/1,128.25
  6. Step 6: Final answer
    x = 581.80

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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.