Home / 21,301.20-31,956.60-12,531.60

Finding the Fourth Proportional to 21,301.20, 31,956.60 and 12,531.60

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Solution

The fourth proportional to 21,301.20, 31,956.60 and 12,531.60 is: 18,800.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,301.20 : 31,956.60 = 12,531.60 : x
  2. Step 2: Convert to fraction form
    21,301.20/31,956.60 = 12,531.60/x
  3. Step 3: Cross multiply
    21,301.20x = 31,956.60 × 12,531.60
  4. Step 4: Simplify right side
    21,301.20x = 400,467,328.56
  5. Step 5: Solve for x
    x = 400,467,328.56/21,301.20
  6. Step 6: Final answer
    x = 18,800.22

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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.