Home / 21,319.76-31,922.24-13,905.84

Finding the Fourth Proportional to 21,319.76, 31,922.24 and 13,905.84

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Solution

The fourth proportional to 21,319.76, 31,922.24 and 13,905.84 is: 20,821.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.76 : 31,922.24 = 13,905.84 : x
  2. Step 2: Convert to fraction form
    21,319.76/31,922.24 = 13,905.84/x
  3. Step 3: Cross multiply
    21,319.76x = 31,922.24 × 13,905.84
  4. Step 4: Simplify right side
    21,319.76x = 443,905,561.88
  5. Step 5: Solve for x
    x = 443,905,561.88/21,319.76
  6. Step 6: Final answer
    x = 20,821.32

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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.