Home / 21,534.80-29,727.12-20,189.68

Finding the Fourth Proportional to 21,534.80, 29,727.12 and 20,189.68

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Solution

The fourth proportional to 21,534.80, 29,727.12 and 20,189.68 is: 27,870.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,534.80 : 29,727.12 = 20,189.68 : x
  2. Step 2: Convert to fraction form
    21,534.80/29,727.12 = 20,189.68/x
  3. Step 3: Cross multiply
    21,534.80x = 29,727.12 × 20,189.68
  4. Step 4: Simplify right side
    21,534.80x = 600,181,040.12
  5. Step 5: Solve for x
    x = 600,181,040.12/21,534.80
  6. Step 6: Final answer
    x = 27,870.29

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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.