Home / 1,327.12-1,990.68-353.20

Finding the Fourth Proportional to 1,327.12, 1,990.68 and 353.20

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Solution

The fourth proportional to 1,327.12, 1,990.68 and 353.20 is: 529.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.12 : 1,990.68 = 353.20 : x
  2. Step 2: Convert to fraction form
    1,327.12/1,990.68 = 353.20/x
  3. Step 3: Cross multiply
    1,327.12x = 1,990.68 × 353.20
  4. Step 4: Simplify right side
    1,327.12x = 703,108.18
  5. Step 5: Solve for x
    x = 703,108.18/1,327.12
  6. Step 6: Final answer
    x = 529.80

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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.