Home / 20,876.81-31,258.71-15,287.81

Finding the Fourth Proportional to 20,876.81, 31,258.71 and 15,287.81

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Solution

The fourth proportional to 20,876.81, 31,258.71 and 15,287.81 is: 22,890.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,876.81 : 31,258.71 = 15,287.81 : x
  2. Step 2: Convert to fraction form
    20,876.81/31,258.71 = 15,287.81/x
  3. Step 3: Cross multiply
    20,876.81x = 31,258.71 × 15,287.81
  4. Step 4: Simplify right side
    20,876.81x = 477,877,063.03
  5. Step 5: Solve for x
    x = 477,877,063.03/20,876.81
  6. Step 6: Final answer
    x = 22,890.34

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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.