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Finding the Fourth Proportional to 1,128.45, 1,692.90 and 398.54

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Solution

The fourth proportional to 1,128.45, 1,692.90 and 398.54 is: 597.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.45 : 1,692.90 = 398.54 : x
  2. Step 2: Convert to fraction form
    1,128.45/1,692.90 = 398.54/x
  3. Step 3: Cross multiply
    1,128.45x = 1,692.90 × 398.54
  4. Step 4: Simplify right side
    1,128.45x = 674,687.91
  5. Step 5: Solve for x
    x = 674,687.91/1,128.45
  6. Step 6: Final answer
    x = 597.89

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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.