Home / 1,721.12-2,581.65-422.60

Finding the Fourth Proportional to 1,721.12, 2,581.65 and 422.60

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Solution

The fourth proportional to 1,721.12, 2,581.65 and 422.60 is: 633.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.12 : 2,581.65 = 422.60 : x
  2. Step 2: Convert to fraction form
    1,721.12/2,581.65 = 422.60/x
  3. Step 3: Cross multiply
    1,721.12x = 2,581.65 × 422.60
  4. Step 4: Simplify right side
    1,721.12x = 1,090,992.38
  5. Step 5: Solve for x
    x = 1,090,992.38/1,721.12
  6. Step 6: Final answer
    x = 633.89

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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.