Home / 13,991.16-21,028.19-12,959.90

Finding the Fourth Proportional to 13,991.16, 21,028.19 and 12,959.90

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Solution

The fourth proportional to 13,991.16, 21,028.19 and 12,959.90 is: 19,478.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.16 : 21,028.19 = 12,959.90 : x
  2. Step 2: Convert to fraction form
    13,991.16/21,028.19 = 12,959.90/x
  3. Step 3: Cross multiply
    13,991.16x = 21,028.19 × 12,959.90
  4. Step 4: Simplify right side
    13,991.16x = 272,523,069.64
  5. Step 5: Solve for x
    x = 272,523,069.64/13,991.16
  6. Step 6: Final answer
    x = 19,478.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.