Home / 20,909.36-31,353.96-12,146.78

Finding the Fourth Proportional to 20,909.36, 31,353.96 and 12,146.78

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Solution

The fourth proportional to 20,909.36, 31,353.96 and 12,146.78 is: 18,214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.36 : 31,353.96 = 12,146.78 : x
  2. Step 2: Convert to fraction form
    20,909.36/31,353.96 = 12,146.78/x
  3. Step 3: Cross multiply
    20,909.36x = 31,353.96 × 12,146.78
  4. Step 4: Simplify right side
    20,909.36x = 380,849,778.18
  5. Step 5: Solve for x
    x = 380,849,778.18/20,909.36
  6. Step 6: Final answer
    x = 18,214.32

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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.