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Finding the Fourth Proportional to 16,987.80, 25,481.70 and 12,379.80

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Solution

The fourth proportional to 16,987.80, 25,481.70 and 12,379.80 is: 18,569.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,987.80 : 25,481.70 = 12,379.80 : x
  2. Step 2: Convert to fraction form
    16,987.80/25,481.70 = 12,379.80/x
  3. Step 3: Cross multiply
    16,987.80x = 25,481.70 × 12,379.80
  4. Step 4: Simplify right side
    16,987.80x = 315,458,349.66
  5. Step 5: Solve for x
    x = 315,458,349.66/16,987.80
  6. Step 6: Final answer
    x = 18,569.70

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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.