Home / 20,820.09-31,203.30-18,140.82

Finding the Fourth Proportional to 20,820.09, 31,203.30 and 18,140.82

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Solution

The fourth proportional to 20,820.09, 31,203.30 and 18,140.82 is: 27,187.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.09 : 31,203.30 = 18,140.82 : x
  2. Step 2: Convert to fraction form
    20,820.09/31,203.30 = 18,140.82/x
  3. Step 3: Cross multiply
    20,820.09x = 31,203.30 × 18,140.82
  4. Step 4: Simplify right side
    20,820.09x = 566,053,448.71
  5. Step 5: Solve for x
    x = 566,053,448.71/20,820.09
  6. Step 6: Final answer
    x = 27,187.85

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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.