Home / 20,724.40-31,086.60-18,877.60

Finding the Fourth Proportional to 20,724.40, 31,086.60 and 18,877.60

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Solution

The fourth proportional to 20,724.40, 31,086.60 and 18,877.60 is: 28,316.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,724.40 : 31,086.60 = 18,877.60 : x
  2. Step 2: Convert to fraction form
    20,724.40/31,086.60 = 18,877.60/x
  3. Step 3: Cross multiply
    20,724.40x = 31,086.60 × 18,877.60
  4. Step 4: Simplify right side
    20,724.40x = 586,840,400.16
  5. Step 5: Solve for x
    x = 586,840,400.16/20,724.40
  6. Step 6: Final answer
    x = 28,316.40

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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.