Home / 20,139.40-30,209.10-12,752.20

Finding the Fourth Proportional to 20,139.40, 30,209.10 and 12,752.20

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Solution

The fourth proportional to 20,139.40, 30,209.10 and 12,752.20 is: 19,128.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.40 : 30,209.10 = 12,752.20 : x
  2. Step 2: Convert to fraction form
    20,139.40/30,209.10 = 12,752.20/x
  3. Step 3: Cross multiply
    20,139.40x = 30,209.10 × 12,752.20
  4. Step 4: Simplify right side
    20,139.40x = 385,232,485.02
  5. Step 5: Solve for x
    x = 385,232,485.02/20,139.40
  6. Step 6: Final answer
    x = 19,128.30

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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.