Home / 20,708.16-31,062.23-5,125.78

Finding the Fourth Proportional to 20,708.16, 31,062.23 and 5,125.78

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Solution

The fourth proportional to 20,708.16, 31,062.23 and 5,125.78 is: 7,688.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,708.16 : 31,062.23 = 5,125.78 : x
  2. Step 2: Convert to fraction form
    20,708.16/31,062.23 = 5,125.78/x
  3. Step 3: Cross multiply
    20,708.16x = 31,062.23 × 5,125.78
  4. Step 4: Simplify right side
    20,708.16x = 159,218,218.54
  5. Step 5: Solve for x
    x = 159,218,218.54/20,708.16
  6. Step 6: Final answer
    x = 7,688.67

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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.