Home / 1,327.20-1,990.86-402.89

Finding the Fourth Proportional to 1,327.20, 1,990.86 and 402.89

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Solution

The fourth proportional to 1,327.20, 1,990.86 and 402.89 is: 604.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.20 : 1,990.86 = 402.89 : x
  2. Step 2: Convert to fraction form
    1,327.20/1,990.86 = 402.89/x
  3. Step 3: Cross multiply
    1,327.20x = 1,990.86 × 402.89
  4. Step 4: Simplify right side
    1,327.20x = 802,085.62
  5. Step 5: Solve for x
    x = 802,085.62/1,327.20
  6. Step 6: Final answer
    x = 604.35

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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.