Home / 1,438.80-2,155.79-1,091.72

Finding the Fourth Proportional to 1,438.80, 2,155.79 and 1,091.72

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Solution

The fourth proportional to 1,438.80, 2,155.79 and 1,091.72 is: 1,635.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.80 : 2,155.79 = 1,091.72 : x
  2. Step 2: Convert to fraction form
    1,438.80/2,155.79 = 1,091.72/x
  3. Step 3: Cross multiply
    1,438.80x = 2,155.79 × 1,091.72
  4. Step 4: Simplify right side
    1,438.80x = 2,353,519.06
  5. Step 5: Solve for x
    x = 2,353,519.06/1,438.80
  6. Step 6: Final answer
    x = 1,635.75

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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.