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Finding the Fourth Proportional to 1,399.82, 2,100.20 and 578.48

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Solution

The fourth proportional to 1,399.82, 2,100.20 and 578.48 is: 867.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.82 : 2,100.20 = 578.48 : x
  2. Step 2: Convert to fraction form
    1,399.82/2,100.20 = 578.48/x
  3. Step 3: Cross multiply
    1,399.82x = 2,100.20 × 578.48
  4. Step 4: Simplify right side
    1,399.82x = 1,214,910.30
  5. Step 5: Solve for x
    x = 1,214,910.30/1,399.82
  6. Step 6: Final answer
    x = 867.91

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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.