Home / 20,724.60-31,111.20-12,412.20

Finding the Fourth Proportional to 20,724.60, 31,111.20 and 12,412.20

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Solution

The fourth proportional to 20,724.60, 31,111.20 and 12,412.20 is: 18,632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,724.60 : 31,111.20 = 12,412.20 : x
  2. Step 2: Convert to fraction form
    20,724.60/31,111.20 = 12,412.20/x
  3. Step 3: Cross multiply
    20,724.60x = 31,111.20 × 12,412.20
  4. Step 4: Simplify right side
    20,724.60x = 386,158,436.64
  5. Step 5: Solve for x
    x = 386,158,436.64/20,724.60
  6. Step 6: Final answer
    x = 18,632.85

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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.