Home / 21,143.86-31,719.45-7,105.26

Finding the Fourth Proportional to 21,143.86, 31,719.45 and 7,105.26

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Solution

The fourth proportional to 21,143.86, 31,719.45 and 7,105.26 is: 10,659.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.86 : 31,719.45 = 7,105.26 : x
  2. Step 2: Convert to fraction form
    21,143.86/31,719.45 = 7,105.26/x
  3. Step 3: Cross multiply
    21,143.86x = 31,719.45 × 7,105.26
  4. Step 4: Simplify right side
    21,143.86x = 225,374,939.31
  5. Step 5: Solve for x
    x = 225,374,939.31/21,143.86
  6. Step 6: Final answer
    x = 10,659.12

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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.