Home / 20,992.16-31,426.80-12,728.48

Finding the Fourth Proportional to 20,992.16, 31,426.80 and 12,728.48

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Solution

The fourth proportional to 20,992.16, 31,426.80 and 12,728.48 is: 19,055.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.16 : 31,426.80 = 12,728.48 : x
  2. Step 2: Convert to fraction form
    20,992.16/31,426.80 = 12,728.48/x
  3. Step 3: Cross multiply
    20,992.16x = 31,426.80 × 12,728.48
  4. Step 4: Simplify right side
    20,992.16x = 400,015,395.26
  5. Step 5: Solve for x
    x = 400,015,395.26/20,992.16
  6. Step 6: Final answer
    x = 19,055.47

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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.