Home / 21,315.76-31,916.24-13,901.84

Finding the Fourth Proportional to 21,315.76, 31,916.24 and 13,901.84

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Solution

The fourth proportional to 21,315.76, 31,916.24 and 13,901.84 is: 20,815.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,315.76 : 31,916.24 = 13,901.84 : x
  2. Step 2: Convert to fraction form
    21,315.76/31,916.24 = 13,901.84/x
  3. Step 3: Cross multiply
    21,315.76x = 31,916.24 × 13,901.84
  4. Step 4: Simplify right side
    21,315.76x = 443,694,461.88
  5. Step 5: Solve for x
    x = 443,694,461.88/21,315.76
  6. Step 6: Final answer
    x = 20,815.32

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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.