Home / 20,976.88-31,428.40-19,728.24

Finding the Fourth Proportional to 20,976.88, 31,428.40 and 19,728.24

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Solution

The fourth proportional to 20,976.88, 31,428.40 and 19,728.24 is: 29,557.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.88 : 31,428.40 = 19,728.24 : x
  2. Step 2: Convert to fraction form
    20,976.88/31,428.40 = 19,728.24/x
  3. Step 3: Cross multiply
    20,976.88x = 31,428.40 × 19,728.24
  4. Step 4: Simplify right side
    20,976.88x = 620,027,018.02
  5. Step 5: Solve for x
    x = 620,027,018.02/20,976.88
  6. Step 6: Final answer
    x = 29,557.64

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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.