Home / 20,872.08-31,287.06-13,086.36

Finding the Fourth Proportional to 20,872.08, 31,287.06 and 13,086.36

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Solution

The fourth proportional to 20,872.08, 31,287.06 and 13,086.36 is: 19,616.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.08 : 31,287.06 = 13,086.36 : x
  2. Step 2: Convert to fraction form
    20,872.08/31,287.06 = 13,086.36/x
  3. Step 3: Cross multiply
    20,872.08x = 31,287.06 × 13,086.36
  4. Step 4: Simplify right side
    20,872.08x = 409,433,730.50
  5. Step 5: Solve for x
    x = 409,433,730.50/20,872.08
  6. Step 6: Final answer
    x = 19,616.34

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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.