Home / 20,440.40-30,660.60-8,128.40

Finding the Fourth Proportional to 20,440.40, 30,660.60 and 8,128.40

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Solution

The fourth proportional to 20,440.40, 30,660.60 and 8,128.40 is: 12,192.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,440.40 : 30,660.60 = 8,128.40 : x
  2. Step 2: Convert to fraction form
    20,440.40/30,660.60 = 8,128.40/x
  3. Step 3: Cross multiply
    20,440.40x = 30,660.60 × 8,128.40
  4. Step 4: Simplify right side
    20,440.40x = 249,221,621.04
  5. Step 5: Solve for x
    x = 249,221,621.04/20,440.40
  6. Step 6: Final answer
    x = 12,192.60

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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.