Home / 21,207.90-29,247.36-13,640.88

Finding the Fourth Proportional to 21,207.90, 29,247.36 and 13,640.88

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Solution

The fourth proportional to 21,207.90, 29,247.36 and 13,640.88 is: 18,811.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.90 : 29,247.36 = 13,640.88 : x
  2. Step 2: Convert to fraction form
    21,207.90/29,247.36 = 13,640.88/x
  3. Step 3: Cross multiply
    21,207.90x = 29,247.36 × 13,640.88
  4. Step 4: Simplify right side
    21,207.90x = 398,959,728.08
  5. Step 5: Solve for x
    x = 398,959,728.08/21,207.90
  6. Step 6: Final answer
    x = 18,811.85

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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.