Home / 1,721.63-2,371.51-1,389.13

Finding the Fourth Proportional to 1,721.63, 2,371.51 and 1,389.13

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Solution

The fourth proportional to 1,721.63, 2,371.51 and 1,389.13 is: 1,913.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.63 : 2,371.51 = 1,389.13 : x
  2. Step 2: Convert to fraction form
    1,721.63/2,371.51 = 1,389.13/x
  3. Step 3: Cross multiply
    1,721.63x = 2,371.51 × 1,389.13
  4. Step 4: Simplify right side
    1,721.63x = 3,294,331.49
  5. Step 5: Solve for x
    x = 3,294,331.49/1,721.63
  6. Step 6: Final answer
    x = 1,913.49

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1.5x scale

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.