Home / 1,988,121.60-2,982,679.20-640,411.20

Finding the Fourth Proportional to 1,988,121.60, 2,982,679.20 and 640,411.20

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Solution

The fourth proportional to 1,988,121.60, 2,982,679.20 and 640,411.20 is: 960,776.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988,121.60 : 2,982,679.20 = 640,411.20 : x
  2. Step 2: Convert to fraction form
    1,988,121.60/2,982,679.20 = 640,411.20/x
  3. Step 3: Cross multiply
    1,988,121.60x = 2,982,679.20 × 640,411.20
  4. Step 4: Simplify right side
    1,988,121.60x = 1,910,141,165,687.04
  5. Step 5: Solve for x
    x = 1,910,141,165,687.04/1,988,121.60
  6. Step 6: Final answer
    x = 960,776.83

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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.