Home / 21,629.13-29,850.30-13,129.31

Finding the Fourth Proportional to 21,629.13, 29,850.30 and 13,129.31

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Solution

The fourth proportional to 21,629.13, 29,850.30 and 13,129.31 is: 18,119.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,629.13 : 29,850.30 = 13,129.31 : x
  2. Step 2: Convert to fraction form
    21,629.13/29,850.30 = 13,129.31/x
  3. Step 3: Cross multiply
    21,629.13x = 29,850.30 × 13,129.31
  4. Step 4: Simplify right side
    21,629.13x = 391,913,693.04
  5. Step 5: Solve for x
    x = 391,913,693.04/21,629.13
  6. Step 6: Final answer
    x = 18,119.72

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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.