Home / 20,738.60-31,107.90-12,444.20

Finding the Fourth Proportional to 20,738.60, 31,107.90 and 12,444.20

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Solution

The fourth proportional to 20,738.60, 31,107.90 and 12,444.20 is: 18,666.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.60 : 31,107.90 = 12,444.20 : x
  2. Step 2: Convert to fraction form
    20,738.60/31,107.90 = 12,444.20/x
  3. Step 3: Cross multiply
    20,738.60x = 31,107.90 × 12,444.20
  4. Step 4: Simplify right side
    20,738.60x = 387,112,929.18
  5. Step 5: Solve for x
    x = 387,112,929.18/20,738.60
  6. Step 6: Final answer
    x = 18,666.30

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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.