Home / 20,979.60-31,469.40-20,173.20

Finding the Fourth Proportional to 20,979.60, 31,469.40 and 20,173.20

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Solution

The fourth proportional to 20,979.60, 31,469.40 and 20,173.20 is: 30,259.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.60 : 31,469.40 = 20,173.20 : x
  2. Step 2: Convert to fraction form
    20,979.60/31,469.40 = 20,173.20/x
  3. Step 3: Cross multiply
    20,979.60x = 31,469.40 × 20,173.20
  4. Step 4: Simplify right side
    20,979.60x = 634,838,500.08
  5. Step 5: Solve for x
    x = 634,838,500.08/20,979.60
  6. Step 6: Final answer
    x = 30,259.80

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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.