Home / 1,272.20-1,908.30-923.90

Finding the Fourth Proportional to 1,272.20, 1,908.30 and 923.90

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Solution

The fourth proportional to 1,272.20, 1,908.30 and 923.90 is: 1,385.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.20 : 1,908.30 = 923.90 : x
  2. Step 2: Convert to fraction form
    1,272.20/1,908.30 = 923.90/x
  3. Step 3: Cross multiply
    1,272.20x = 1,908.30 × 923.90
  4. Step 4: Simplify right side
    1,272.20x = 1,763,078.37
  5. Step 5: Solve for x
    x = 1,763,078.37/1,272.20
  6. Step 6: Final answer
    x = 1,385.85

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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.