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Finding the Fourth Proportional to 18,001.80, 26,978.40 and 12,061.80

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Solution

The fourth proportional to 18,001.80, 26,978.40 and 12,061.80 is: 18,076.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,001.80 : 26,978.40 = 12,061.80 : x
  2. Step 2: Convert to fraction form
    18,001.80/26,978.40 = 12,061.80/x
  3. Step 3: Cross multiply
    18,001.80x = 26,978.40 × 12,061.80
  4. Step 4: Simplify right side
    18,001.80x = 325,408,065.12
  5. Step 5: Solve for x
    x = 325,408,065.12/18,001.80
  6. Step 6: Final answer
    x = 18,076.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.