Home / 20,889.81-28,831.91-12,396.65

Finding the Fourth Proportional to 20,889.81, 28,831.91 and 12,396.65

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Solution

The fourth proportional to 20,889.81, 28,831.91 and 12,396.65 is: 17,109.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.81 : 28,831.91 = 12,396.65 : x
  2. Step 2: Convert to fraction form
    20,889.81/28,831.91 = 12,396.65/x
  3. Step 3: Cross multiply
    20,889.81x = 28,831.91 × 12,396.65
  4. Step 4: Simplify right side
    20,889.81x = 357,418,890.96
  5. Step 5: Solve for x
    x = 357,418,890.96/20,889.81
  6. Step 6: Final answer
    x = 17,109.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.