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Finding the Fourth Proportional to 1,721.81, 2,358.24 and 1,620.79

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Solution

The fourth proportional to 1,721.81, 2,358.24 and 1,620.79 is: 2,219.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.81 : 2,358.24 = 1,620.79 : x
  2. Step 2: Convert to fraction form
    1,721.81/2,358.24 = 1,620.79/x
  3. Step 3: Cross multiply
    1,721.81x = 2,358.24 × 1,620.79
  4. Step 4: Simplify right side
    1,721.81x = 3,822,211.81
  5. Step 5: Solve for x
    x = 3,822,211.81/1,721.81
  6. Step 6: Final answer
    x = 2,219.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.