Home / 1,721.34-2,374.38-1,389.78

Finding the Fourth Proportional to 1,721.34, 2,374.38 and 1,389.78

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Solution

The fourth proportional to 1,721.34, 2,374.38 and 1,389.78 is: 1,917.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.34 : 2,374.38 = 1,389.78 : x
  2. Step 2: Convert to fraction form
    1,721.34/2,374.38 = 1,389.78/x
  3. Step 3: Cross multiply
    1,721.34x = 2,374.38 × 1,389.78
  4. Step 4: Simplify right side
    1,721.34x = 3,299,865.84
  5. Step 5: Solve for x
    x = 3,299,865.84/1,721.34
  6. Step 6: Final answer
    x = 1,917.03

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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.