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Finding the Fourth Proportional to 18,874, 28,421.08 and 13,978.36

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Solution

The fourth proportional to 18,874, 28,421.08 and 13,978.36 is: 21,049.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874 : 28,421.08 = 13,978.36 : x
  2. Step 2: Convert to fraction form
    18,874/28,421.08 = 13,978.36/x
  3. Step 3: Cross multiply
    18,874x = 28,421.08 × 13,978.36
  4. Step 4: Simplify right side
    18,874x = 397,280,087.83
  5. Step 5: Solve for x
    x = 397,280,087.83/18,874
  6. Step 6: Final answer
    x = 21,049.07

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.