Home / 20,814.80-31,222.20-7,667.60

Finding the Fourth Proportional to 20,814.80, 31,222.20 and 7,667.60

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Solution

The fourth proportional to 20,814.80, 31,222.20 and 7,667.60 is: 11,501.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,814.80 : 31,222.20 = 7,667.60 : x
  2. Step 2: Convert to fraction form
    20,814.80/31,222.20 = 7,667.60/x
  3. Step 3: Cross multiply
    20,814.80x = 31,222.20 × 7,667.60
  4. Step 4: Simplify right side
    20,814.80x = 239,399,340.72
  5. Step 5: Solve for x
    x = 239,399,340.72/20,814.80
  6. Step 6: Final answer
    x = 11,501.40

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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.