Home / 1,395.20-2,091.52-1,121.92

Finding the Fourth Proportional to 1,395.20, 2,091.52 and 1,121.92

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Solution

The fourth proportional to 1,395.20, 2,091.52 and 1,121.92 is: 1,681.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.20 : 2,091.52 = 1,121.92 : x
  2. Step 2: Convert to fraction form
    1,395.20/2,091.52 = 1,121.92/x
  3. Step 3: Cross multiply
    1,395.20x = 2,091.52 × 1,121.92
  4. Step 4: Simplify right side
    1,395.20x = 2,346,518.12
  5. Step 5: Solve for x
    x = 2,346,518.12/1,395.20
  6. Step 6: Final answer
    x = 1,681.85

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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.