Home / 20,721.96-31,083.08-5,139.72

Finding the Fourth Proportional to 20,721.96, 31,083.08 and 5,139.72

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Solution

The fourth proportional to 20,721.96, 31,083.08 and 5,139.72 is: 7,709.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.96 : 31,083.08 = 5,139.72 : x
  2. Step 2: Convert to fraction form
    20,721.96/31,083.08 = 5,139.72/x
  3. Step 3: Cross multiply
    20,721.96x = 31,083.08 × 5,139.72
  4. Step 4: Simplify right side
    20,721.96x = 159,758,302.24
  5. Step 5: Solve for x
    x = 159,758,302.24/20,721.96
  6. Step 6: Final answer
    x = 7,709.61

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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.