Home / 1,380.11-2,069.39-442.89

Finding the Fourth Proportional to 1,380.11, 2,069.39 and 442.89

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Solution

The fourth proportional to 1,380.11, 2,069.39 and 442.89 is: 664.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.11 : 2,069.39 = 442.89 : x
  2. Step 2: Convert to fraction form
    1,380.11/2,069.39 = 442.89/x
  3. Step 3: Cross multiply
    1,380.11x = 2,069.39 × 442.89
  4. Step 4: Simplify right side
    1,380.11x = 916,509.92
  5. Step 5: Solve for x
    x = 916,509.92/1,380.11
  6. Step 6: Final answer
    x = 664.09

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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.