Home / 20,968.80-31,443.12-12,206.40

Finding the Fourth Proportional to 20,968.80, 31,443.12 and 12,206.40

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Solution

The fourth proportional to 20,968.80, 31,443.12 and 12,206.40 is: 18,303.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.80 : 31,443.12 = 12,206.40 : x
  2. Step 2: Convert to fraction form
    20,968.80/31,443.12 = 12,206.40/x
  3. Step 3: Cross multiply
    20,968.80x = 31,443.12 × 12,206.40
  4. Step 4: Simplify right side
    20,968.80x = 383,807,299.97
  5. Step 5: Solve for x
    x = 383,807,299.97/20,968.80
  6. Step 6: Final answer
    x = 18,303.73

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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.