Home / 20,378.40-30,556.80-7,231.20

Finding the Fourth Proportional to 20,378.40, 30,556.80 and 7,231.20

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Solution

The fourth proportional to 20,378.40, 30,556.80 and 7,231.20 is: 10,842.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.40 : 30,556.80 = 7,231.20 : x
  2. Step 2: Convert to fraction form
    20,378.40/30,556.80 = 7,231.20/x
  3. Step 3: Cross multiply
    20,378.40x = 30,556.80 × 7,231.20
  4. Step 4: Simplify right side
    20,378.40x = 220,962,332.16
  5. Step 5: Solve for x
    x = 220,962,332.16/20,378.40
  6. Step 6: Final answer
    x = 10,842.97

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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.