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Finding the Fourth Proportional to 18,979.81, 26,184.81 and 11,428.18

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Solution

The fourth proportional to 18,979.81, 26,184.81 and 11,428.18 is: 15,766.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.81 : 26,184.81 = 11,428.18 : x
  2. Step 2: Convert to fraction form
    18,979.81/26,184.81 = 11,428.18/x
  3. Step 3: Cross multiply
    18,979.81x = 26,184.81 × 11,428.18
  4. Step 4: Simplify right side
    18,979.81x = 299,244,721.95
  5. Step 5: Solve for x
    x = 299,244,721.95/18,979.81
  6. Step 6: Final answer
    x = 15,766.48

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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.