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Finding the Fourth Proportional to 18,720.94, 27,919.04 and 15,965.32

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Solution

The fourth proportional to 18,720.94, 27,919.04 and 15,965.32 is: 23,809.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.94 : 27,919.04 = 15,965.32 : x
  2. Step 2: Convert to fraction form
    18,720.94/27,919.04 = 15,965.32/x
  3. Step 3: Cross multiply
    18,720.94x = 27,919.04 × 15,965.32
  4. Step 4: Simplify right side
    18,720.94x = 445,736,407.69
  5. Step 5: Solve for x
    x = 445,736,407.69/18,720.94
  6. Step 6: Final answer
    x = 23,809.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.