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Finding the Fourth Proportional to 15,855.30, 21,879.48 and 8,781.30

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Solution

The fourth proportional to 15,855.30, 21,879.48 and 8,781.30 is: 12,117.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.30 : 21,879.48 = 8,781.30 : x
  2. Step 2: Convert to fraction form
    15,855.30/21,879.48 = 8,781.30/x
  3. Step 3: Cross multiply
    15,855.30x = 21,879.48 × 8,781.30
  4. Step 4: Simplify right side
    15,855.30x = 192,130,277.72
  5. Step 5: Solve for x
    x = 192,130,277.72/15,855.30
  6. Step 6: Final answer
    x = 12,117.73

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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.