Home / 1,628.30-2,438.40-1,215.20

Finding the Fourth Proportional to 1,628.30, 2,438.40 and 1,215.20

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Solution

The fourth proportional to 1,628.30, 2,438.40 and 1,215.20 is: 1,819.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.30 : 2,438.40 = 1,215.20 : x
  2. Step 2: Convert to fraction form
    1,628.30/2,438.40 = 1,215.20/x
  3. Step 3: Cross multiply
    1,628.30x = 2,438.40 × 1,215.20
  4. Step 4: Simplify right side
    1,628.30x = 2,963,143.68
  5. Step 5: Solve for x
    x = 2,963,143.68/1,628.30
  6. Step 6: Final answer
    x = 1,819.78

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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.