Home / 20,912.60-31,341.21-15,339.85

Finding the Fourth Proportional to 20,912.60, 31,341.21 and 15,339.85

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Solution

The fourth proportional to 20,912.60, 31,341.21 and 15,339.85 is: 22,989.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.60 : 31,341.21 = 15,339.85 : x
  2. Step 2: Convert to fraction form
    20,912.60/31,341.21 = 15,339.85/x
  3. Step 3: Cross multiply
    20,912.60x = 31,341.21 × 15,339.85
  4. Step 4: Simplify right side
    20,912.60x = 480,769,460.22
  5. Step 5: Solve for x
    x = 480,769,460.22/20,912.60
  6. Step 6: Final answer
    x = 22,989.46

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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.