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Finding the Fourth Proportional to 1,721.92, 2,372.16 and 1,389.44

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Solution

The fourth proportional to 1,721.92, 2,372.16 and 1,389.44 is: 1,914.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.92 : 2,372.16 = 1,389.44 : x
  2. Step 2: Convert to fraction form
    1,721.92/2,372.16 = 1,389.44/x
  3. Step 3: Cross multiply
    1,721.92x = 2,372.16 × 1,389.44
  4. Step 4: Simplify right side
    1,721.92x = 3,295,973.99
  5. Step 5: Solve for x
    x = 3,295,973.99/1,721.92
  6. Step 6: Final answer
    x = 1,914.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.