Home / 20,720.91-31,095.72-8,239.65

Finding the Fourth Proportional to 20,720.91, 31,095.72 and 8,239.65

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Solution

The fourth proportional to 20,720.91, 31,095.72 and 8,239.65 is: 12,365.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.91 : 31,095.72 = 8,239.65 : x
  2. Step 2: Convert to fraction form
    20,720.91/31,095.72 = 8,239.65/x
  3. Step 3: Cross multiply
    20,720.91x = 31,095.72 × 8,239.65
  4. Step 4: Simplify right side
    20,720.91x = 256,217,849.30
  5. Step 5: Solve for x
    x = 256,217,849.30/20,720.91
  6. Step 6: Final answer
    x = 12,365.18

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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.