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Finding the Fourth Proportional to 18,700.80, 27,978.30 and 12,139.80

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Solution

The fourth proportional to 18,700.80, 27,978.30 and 12,139.80 is: 18,162.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,700.80 : 27,978.30 = 12,139.80 : x
  2. Step 2: Convert to fraction form
    18,700.80/27,978.30 = 12,139.80/x
  3. Step 3: Cross multiply
    18,700.80x = 27,978.30 × 12,139.80
  4. Step 4: Simplify right side
    18,700.80x = 339,650,966.34
  5. Step 5: Solve for x
    x = 339,650,966.34/18,700.80
  6. Step 6: Final answer
    x = 18,162.38

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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.