Home / 19,986.80-29,999.40-10,137.20

Finding the Fourth Proportional to 19,986.80, 29,999.40 and 10,137.20

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Solution

The fourth proportional to 19,986.80, 29,999.40 and 10,137.20 is: 15,215.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,986.80 : 29,999.40 = 10,137.20 : x
  2. Step 2: Convert to fraction form
    19,986.80/29,999.40 = 10,137.20/x
  3. Step 3: Cross multiply
    19,986.80x = 29,999.40 × 10,137.20
  4. Step 4: Simplify right side
    19,986.80x = 304,109,917.68
  5. Step 5: Solve for x
    x = 304,109,917.68/19,986.80
  6. Step 6: Final answer
    x = 15,215.54

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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.