Home / 13,721.21-18,948.72-11,720.10

Finding the Fourth Proportional to 13,721.21, 18,948.72 and 11,720.10

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Solution

The fourth proportional to 13,721.21, 18,948.72 and 11,720.10 is: 16,185.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,721.21 : 18,948.72 = 11,720.10 : x
  2. Step 2: Convert to fraction form
    13,721.21/18,948.72 = 11,720.10/x
  3. Step 3: Cross multiply
    13,721.21x = 18,948.72 × 11,720.10
  4. Step 4: Simplify right side
    13,721.21x = 222,081,008.28
  5. Step 5: Solve for x
    x = 222,081,008.28/13,721.21
  6. Step 6: Final answer
    x = 16,185.24

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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.