Home / 21,126.36-31,653.90-13,719.72

Finding the Fourth Proportional to 21,126.36, 31,653.90 and 13,719.72

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Solution

The fourth proportional to 21,126.36, 31,653.90 and 13,719.72 is: 20,556.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,126.36 : 31,653.90 = 13,719.72 : x
  2. Step 2: Convert to fraction form
    21,126.36/31,653.90 = 13,719.72/x
  3. Step 3: Cross multiply
    21,126.36x = 31,653.90 × 13,719.72
  4. Step 4: Simplify right side
    21,126.36x = 434,282,644.91
  5. Step 5: Solve for x
    x = 434,282,644.91/21,126.36
  6. Step 6: Final answer
    x = 20,556.43

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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.