Home / 21,317.76-31,919.24-13,903.84

Finding the Fourth Proportional to 21,317.76, 31,919.24 and 13,903.84

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Solution

The fourth proportional to 21,317.76, 31,919.24 and 13,903.84 is: 20,818.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,317.76 : 31,919.24 = 13,903.84 : x
  2. Step 2: Convert to fraction form
    21,317.76/31,919.24 = 13,903.84/x
  3. Step 3: Cross multiply
    21,317.76x = 31,919.24 × 13,903.84
  4. Step 4: Simplify right side
    21,317.76x = 443,800,005.88
  5. Step 5: Solve for x
    x = 443,800,005.88/21,317.76
  6. Step 6: Final answer
    x = 20,818.32

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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.