Home / 1,447.38-2,171.42-421.38

Finding the Fourth Proportional to 1,447.38, 2,171.42 and 421.38

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Solution

The fourth proportional to 1,447.38, 2,171.42 and 421.38 is: 632.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,447.38 : 2,171.42 = 421.38 : x
  2. Step 2: Convert to fraction form
    1,447.38/2,171.42 = 421.38/x
  3. Step 3: Cross multiply
    1,447.38x = 2,171.42 × 421.38
  4. Step 4: Simplify right side
    1,447.38x = 914,992.96
  5. Step 5: Solve for x
    x = 914,992.96/1,447.38
  6. Step 6: Final answer
    x = 632.17

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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.