Home / 21,991.72-30,349.56-15,625.12

Finding the Fourth Proportional to 21,991.72, 30,349.56 and 15,625.12

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Solution

The fourth proportional to 21,991.72, 30,349.56 and 15,625.12 is: 21,563.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.72 : 30,349.56 = 15,625.12 : x
  2. Step 2: Convert to fraction form
    21,991.72/30,349.56 = 15,625.12/x
  3. Step 3: Cross multiply
    21,991.72x = 30,349.56 × 15,625.12
  4. Step 4: Simplify right side
    21,991.72x = 474,215,516.95
  5. Step 5: Solve for x
    x = 474,215,516.95/21,991.72
  6. Step 6: Final answer
    x = 21,563.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.