Home / 20,949.60-31,424.40-20,143.20

Finding the Fourth Proportional to 20,949.60, 31,424.40 and 20,143.20

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Solution

The fourth proportional to 20,949.60, 31,424.40 and 20,143.20 is: 30,214.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.60 : 31,424.40 = 20,143.20 : x
  2. Step 2: Convert to fraction form
    20,949.60/31,424.40 = 20,143.20/x
  3. Step 3: Cross multiply
    20,949.60x = 31,424.40 × 20,143.20
  4. Step 4: Simplify right side
    20,949.60x = 632,987,974.08
  5. Step 5: Solve for x
    x = 632,987,974.08/20,949.60
  6. Step 6: Final answer
    x = 30,214.80

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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.