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Finding the Fourth Proportional to 15,855.22, 21,879.93 and 8,781.49

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Solution

The fourth proportional to 15,855.22, 21,879.93 and 8,781.49 is: 12,118.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.22 : 21,879.93 = 8,781.49 : x
  2. Step 2: Convert to fraction form
    15,855.22/21,879.93 = 8,781.49/x
  3. Step 3: Cross multiply
    15,855.22x = 21,879.93 × 8,781.49
  4. Step 4: Simplify right side
    15,855.22x = 192,138,386.50
  5. Step 5: Solve for x
    x = 192,138,386.50/15,855.22
  6. Step 6: Final answer
    x = 12,118.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.