Home / 2,101.20-3,151.92-802.80

Finding the Fourth Proportional to 2,101.20, 3,151.92 and 802.80

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Solution

The fourth proportional to 2,101.20, 3,151.92 and 802.80 is: 1,204.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.20 : 3,151.92 = 802.80 : x
  2. Step 2: Convert to fraction form
    2,101.20/3,151.92 = 802.80/x
  3. Step 3: Cross multiply
    2,101.20x = 3,151.92 × 802.80
  4. Step 4: Simplify right side
    2,101.20x = 2,530,361.38
  5. Step 5: Solve for x
    x = 2,530,361.38/2,101.20
  6. Step 6: Final answer
    x = 1,204.25

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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.