Home / 20,724.80-31,086.64-5,142.24

Finding the Fourth Proportional to 20,724.80, 31,086.64 and 5,142.24

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Solution

The fourth proportional to 20,724.80, 31,086.64 and 5,142.24 is: 7,713.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,724.80 : 31,086.64 = 5,142.24 : x
  2. Step 2: Convert to fraction form
    20,724.80/31,086.64 = 5,142.24/x
  3. Step 3: Cross multiply
    20,724.80x = 31,086.64 × 5,142.24
  4. Step 4: Simplify right side
    20,724.80x = 159,854,963.67
  5. Step 5: Solve for x
    x = 159,854,963.67/20,724.80
  6. Step 6: Final answer
    x = 7,713.22

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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.