Home / 20,421.15-30,623.78-7,939.52

Finding the Fourth Proportional to 20,421.15, 30,623.78 and 7,939.52

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Solution

The fourth proportional to 20,421.15, 30,623.78 and 7,939.52 is: 11,906.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.15 : 30,623.78 = 7,939.52 : x
  2. Step 2: Convert to fraction form
    20,421.15/30,623.78 = 7,939.52/x
  3. Step 3: Cross multiply
    20,421.15x = 30,623.78 × 7,939.52
  4. Step 4: Simplify right side
    20,421.15x = 243,138,113.79
  5. Step 5: Solve for x
    x = 243,138,113.79/20,421.15
  6. Step 6: Final answer
    x = 11,906.19

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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.