Home / 20,820.80-31,243.40-7,682.32

Finding the Fourth Proportional to 20,820.80, 31,243.40 and 7,682.32

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Solution

The fourth proportional to 20,820.80, 31,243.40 and 7,682.32 is: 11,527.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.80 : 31,243.40 = 7,682.32 : x
  2. Step 2: Convert to fraction form
    20,820.80/31,243.40 = 7,682.32/x
  3. Step 3: Cross multiply
    20,820.80x = 31,243.40 × 7,682.32
  4. Step 4: Simplify right side
    20,820.80x = 240,021,796.69
  5. Step 5: Solve for x
    x = 240,021,796.69/20,820.80
  6. Step 6: Final answer
    x = 11,527.98

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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.