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Finding the Fourth Proportional to 1,128.28, 1,692.54 and 478.92

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Solution

The fourth proportional to 1,128.28, 1,692.54 and 478.92 is: 718.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.28 : 1,692.54 = 478.92 : x
  2. Step 2: Convert to fraction form
    1,128.28/1,692.54 = 478.92/x
  3. Step 3: Cross multiply
    1,128.28x = 1,692.54 × 478.92
  4. Step 4: Simplify right side
    1,128.28x = 810,591.26
  5. Step 5: Solve for x
    x = 810,591.26/1,128.28
  6. Step 6: Final answer
    x = 718.43

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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.