Home / 21,843.72-30,135.78-13,445.64

Finding the Fourth Proportional to 21,843.72, 30,135.78 and 13,445.64

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Solution

The fourth proportional to 21,843.72, 30,135.78 and 13,445.64 is: 18,549.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,843.72 : 30,135.78 = 13,445.64 : x
  2. Step 2: Convert to fraction form
    21,843.72/30,135.78 = 13,445.64/x
  3. Step 3: Cross multiply
    21,843.72x = 30,135.78 × 13,445.64
  4. Step 4: Simplify right side
    21,843.72x = 405,194,849.00
  5. Step 5: Solve for x
    x = 405,194,849.00/21,843.72
  6. Step 6: Final answer
    x = 18,549.72

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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.