Home / 20,912.08-31,359-6,120.66

Finding the Fourth Proportional to 20,912.08, 31,359 and 6,120.66

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Solution

The fourth proportional to 20,912.08, 31,359 and 6,120.66 is: 9,178.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.08 : 31,359 = 6,120.66 : x
  2. Step 2: Convert to fraction form
    20,912.08/31,359 = 6,120.66/x
  3. Step 3: Cross multiply
    20,912.08x = 31,359 × 6,120.66
  4. Step 4: Simplify right side
    20,912.08x = 191,937,776.94
  5. Step 5: Solve for x
    x = 191,937,776.94/20,912.08
  6. Step 6: Final answer
    x = 9,178.32

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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.