Home / 20,717.76-31,076.34-5,135.28

Finding the Fourth Proportional to 20,717.76, 31,076.34 and 5,135.28

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Solution

The fourth proportional to 20,717.76, 31,076.34 and 5,135.28 is: 7,702.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,717.76 : 31,076.34 = 5,135.28 : x
  2. Step 2: Convert to fraction form
    20,717.76/31,076.34 = 5,135.28/x
  3. Step 3: Cross multiply
    20,717.76x = 31,076.34 × 5,135.28
  4. Step 4: Simplify right side
    20,717.76x = 159,585,707.28
  5. Step 5: Solve for x
    x = 159,585,707.28/20,717.76
  6. Step 6: Final answer
    x = 7,702.85

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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.