Home / 20,721.69-31,087.76-5,931.90

Finding the Fourth Proportional to 20,721.69, 31,087.76 and 5,931.90

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Solution

The fourth proportional to 20,721.69, 31,087.76 and 5,931.90 is: 8,899.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,721.69 : 31,087.76 = 5,931.90 : x
  2. Step 2: Convert to fraction form
    20,721.69/31,087.76 = 5,931.90/x
  3. Step 3: Cross multiply
    20,721.69x = 31,087.76 × 5,931.90
  4. Step 4: Simplify right side
    20,721.69x = 184,409,453.88
  5. Step 5: Solve for x
    x = 184,409,453.88/20,721.69
  6. Step 6: Final answer
    x = 8,899.34

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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.