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Finding the Fourth Proportional to 18,684.68, 25,782.71 and 11,129.94

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Solution

The fourth proportional to 18,684.68, 25,782.71 and 11,129.94 is: 15,358.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,684.68 : 25,782.71 = 11,129.94 : x
  2. Step 2: Convert to fraction form
    18,684.68/25,782.71 = 11,129.94/x
  3. Step 3: Cross multiply
    18,684.68x = 25,782.71 × 11,129.94
  4. Step 4: Simplify right side
    18,684.68x = 286,959,959.69
  5. Step 5: Solve for x
    x = 286,959,959.69/18,684.68
  6. Step 6: Final answer
    x = 15,358.04

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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.