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Finding the Fourth Proportional to 1,327.46, 1,991.28 and 353.53

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Solution

The fourth proportional to 1,327.46, 1,991.28 and 353.53 is: 530.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.46 : 1,991.28 = 353.53 : x
  2. Step 2: Convert to fraction form
    1,327.46/1,991.28 = 353.53/x
  3. Step 3: Cross multiply
    1,327.46x = 1,991.28 × 353.53
  4. Step 4: Simplify right side
    1,327.46x = 703,977.22
  5. Step 5: Solve for x
    x = 703,977.22/1,327.46
  6. Step 6: Final answer
    x = 530.32

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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.