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Finding the Fourth Proportional to 18,719.51, 25,838.53 and 11,171.12

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Solution

The fourth proportional to 18,719.51, 25,838.53 and 11,171.12 is: 15,419.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.51 : 25,838.53 = 11,171.12 : x
  2. Step 2: Convert to fraction form
    18,719.51/25,838.53 = 11,171.12/x
  3. Step 3: Cross multiply
    18,719.51x = 25,838.53 × 11,171.12
  4. Step 4: Simplify right side
    18,719.51x = 288,645,162.13
  5. Step 5: Solve for x
    x = 288,645,162.13/18,719.51
  6. Step 6: Final answer
    x = 15,419.49

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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.