Home / 2,912.40-4,368.60-721.17

Finding the Fourth Proportional to 2,912.40, 4,368.60 and 721.17

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Solution

The fourth proportional to 2,912.40, 4,368.60 and 721.17 is: 1,081.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,912.40 : 4,368.60 = 721.17 : x
  2. Step 2: Convert to fraction form
    2,912.40/4,368.60 = 721.17/x
  3. Step 3: Cross multiply
    2,912.40x = 4,368.60 × 721.17
  4. Step 4: Simplify right side
    2,912.40x = 3,150,503.26
  5. Step 5: Solve for x
    x = 3,150,503.26/2,912.40
  6. Step 6: Final answer
    x = 1,081.76

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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.