Home / 20,778.24-31,147.20-10,358.40

Finding the Fourth Proportional to 20,778.24, 31,147.20 and 10,358.40

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Solution

The fourth proportional to 20,778.24, 31,147.20 and 10,358.40 is: 15,527.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.24 : 31,147.20 = 10,358.40 : x
  2. Step 2: Convert to fraction form
    20,778.24/31,147.20 = 10,358.40/x
  3. Step 3: Cross multiply
    20,778.24x = 31,147.20 × 10,358.40
  4. Step 4: Simplify right side
    20,778.24x = 322,635,156.48
  5. Step 5: Solve for x
    x = 322,635,156.48/20,778.24
  6. Step 6: Final answer
    x = 15,527.55

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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.