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Finding the Fourth Proportional to 1,327.18, 1,990.65 and 353.25

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Solution

The fourth proportional to 1,327.18, 1,990.65 and 353.25 is: 529.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.18 : 1,990.65 = 353.25 : x
  2. Step 2: Convert to fraction form
    1,327.18/1,990.65 = 353.25/x
  3. Step 3: Cross multiply
    1,327.18x = 1,990.65 × 353.25
  4. Step 4: Simplify right side
    1,327.18x = 703,187.16
  5. Step 5: Solve for x
    x = 703,187.16/1,327.18
  6. Step 6: Final answer
    x = 529.84

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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.