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Finding the Fourth Proportional to 15,794.34, 21,797.19 and 8,720.79

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Solution

The fourth proportional to 15,794.34, 21,797.19 and 8,720.79 is: 12,035.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,794.34 : 21,797.19 = 8,720.79 : x
  2. Step 2: Convert to fraction form
    15,794.34/21,797.19 = 8,720.79/x
  3. Step 3: Cross multiply
    15,794.34x = 21,797.19 × 8,720.79
  4. Step 4: Simplify right side
    15,794.34x = 190,088,716.58
  5. Step 5: Solve for x
    x = 190,088,716.58/15,794.34
  6. Step 6: Final answer
    x = 12,035.24

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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.