Home / 20,892.20-31,338.30-8,580.20

Finding the Fourth Proportional to 20,892.20, 31,338.30 and 8,580.20

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Solution

The fourth proportional to 20,892.20, 31,338.30 and 8,580.20 is: 12,870.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,892.20 : 31,338.30 = 8,580.20 : x
  2. Step 2: Convert to fraction form
    20,892.20/31,338.30 = 8,580.20/x
  3. Step 3: Cross multiply
    20,892.20x = 31,338.30 × 8,580.20
  4. Step 4: Simplify right side
    20,892.20x = 268,888,881.66
  5. Step 5: Solve for x
    x = 268,888,881.66/20,892.20
  6. Step 6: Final answer
    x = 12,870.30

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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.