Home / 21,161.64-29,189.78-13,617.78

Finding the Fourth Proportional to 21,161.64, 29,189.78 and 13,617.78

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Solution

The fourth proportional to 21,161.64, 29,189.78 and 13,617.78 is: 18,783.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.64 : 29,189.78 = 13,617.78 : x
  2. Step 2: Convert to fraction form
    21,161.64/29,189.78 = 13,617.78/x
  3. Step 3: Cross multiply
    21,161.64x = 29,189.78 × 13,617.78
  4. Step 4: Simplify right side
    21,161.64x = 397,500,002.29
  5. Step 5: Solve for x
    x = 397,500,002.29/21,161.64
  6. Step 6: Final answer
    x = 18,783.99

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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.