Home / 20,968.99-31,438.90-7,817.83

Finding the Fourth Proportional to 20,968.99, 31,438.90 and 7,817.83

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Solution

The fourth proportional to 20,968.99, 31,438.90 and 7,817.83 is: 11,721.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.99 : 31,438.90 = 7,817.83 : x
  2. Step 2: Convert to fraction form
    20,968.99/31,438.90 = 7,817.83/x
  3. Step 3: Cross multiply
    20,968.99x = 31,438.90 × 7,817.83
  4. Step 4: Simplify right side
    20,968.99x = 245,783,975.59
  5. Step 5: Solve for x
    x = 245,783,975.59/20,968.99
  6. Step 6: Final answer
    x = 11,721.31

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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.