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Finding the Fourth Proportional to 692.40, 1,039.12 and 327.28

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Solution

The fourth proportional to 692.40, 1,039.12 and 327.28 is: 491.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    692.40 : 1,039.12 = 327.28 : x
  2. Step 2: Convert to fraction form
    692.40/1,039.12 = 327.28/x
  3. Step 3: Cross multiply
    692.40x = 1,039.12 × 327.28
  4. Step 4: Simplify right side
    692.40x = 340,079.80
  5. Step 5: Solve for x
    x = 340,079.80/692.40
  6. Step 6: Final answer
    x = 491.16

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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.