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Finding the Fourth Proportional to 15,855.15, 21,879.87 and 8,685.01

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Solution

The fourth proportional to 15,855.15, 21,879.87 and 8,685.01 is: 11,985.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.15 : 21,879.87 = 8,685.01 : x
  2. Step 2: Convert to fraction form
    15,855.15/21,879.87 = 8,685.01/x
  3. Step 3: Cross multiply
    15,855.15x = 21,879.87 × 8,685.01
  4. Step 4: Simplify right side
    15,855.15x = 190,026,791.62
  5. Step 5: Solve for x
    x = 190,026,791.62/15,855.15
  6. Step 6: Final answer
    x = 11,985.18

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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.