Home / 20,901.70-31,353.56-8,420.04

Finding the Fourth Proportional to 20,901.70, 31,353.56 and 8,420.04

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Solution

The fourth proportional to 20,901.70, 31,353.56 and 8,420.04 is: 12,630.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.70 : 31,353.56 = 8,420.04 : x
  2. Step 2: Convert to fraction form
    20,901.70/31,353.56 = 8,420.04/x
  3. Step 3: Cross multiply
    20,901.70x = 31,353.56 × 8,420.04
  4. Step 4: Simplify right side
    20,901.70x = 263,998,229.34
  5. Step 5: Solve for x
    x = 263,998,229.34/20,901.70
  6. Step 6: Final answer
    x = 12,630.47

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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.