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Finding the Fourth Proportional to 18,651.87, 27,978.39 and 6,172.59

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Solution

The fourth proportional to 18,651.87, 27,978.39 and 6,172.59 is: 9,259.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,651.87 : 27,978.39 = 6,172.59 : x
  2. Step 2: Convert to fraction form
    18,651.87/27,978.39 = 6,172.59/x
  3. Step 3: Cross multiply
    18,651.87x = 27,978.39 × 6,172.59
  4. Step 4: Simplify right side
    18,651.87x = 172,699,130.33
  5. Step 5: Solve for x
    x = 172,699,130.33/18,651.87
  6. Step 6: Final answer
    x = 9,259.08

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1.5x scale

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.