Home / 21,146.85-31,720.50-7,122.69

Finding the Fourth Proportional to 21,146.85, 31,720.50 and 7,122.69

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Solution

The fourth proportional to 21,146.85, 31,720.50 and 7,122.69 is: 10,684.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,146.85 : 31,720.50 = 7,122.69 : x
  2. Step 2: Convert to fraction form
    21,146.85/31,720.50 = 7,122.69/x
  3. Step 3: Cross multiply
    21,146.85x = 31,720.50 × 7,122.69
  4. Step 4: Simplify right side
    21,146.85x = 225,935,288.15
  5. Step 5: Solve for x
    x = 225,935,288.15/21,146.85
  6. Step 6: Final answer
    x = 10,684.11

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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.