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Finding the Fourth Proportional to 19,720.99, 27,224.54 and 12,659.41

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Solution

The fourth proportional to 19,720.99, 27,224.54 and 12,659.41 is: 17,476.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,720.99 : 27,224.54 = 12,659.41 : x
  2. Step 2: Convert to fraction form
    19,720.99/27,224.54 = 12,659.41/x
  3. Step 3: Cross multiply
    19,720.99x = 27,224.54 × 12,659.41
  4. Step 4: Simplify right side
    19,720.99x = 344,646,613.92
  5. Step 5: Solve for x
    x = 344,646,613.92/19,720.99
  6. Step 6: Final answer
    x = 17,476.13

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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.