Home / 15,855.21-21,881.61-8,783.91

Finding the Fourth Proportional to 15,855.21, 21,881.61 and 8,783.91

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Solution

The fourth proportional to 15,855.21, 21,881.61 and 8,783.91 is: 12,122.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.21 : 21,881.61 = 8,783.91 : x
  2. Step 2: Convert to fraction form
    15,855.21/21,881.61 = 8,783.91/x
  3. Step 3: Cross multiply
    15,855.21x = 21,881.61 × 8,783.91
  4. Step 4: Simplify right side
    15,855.21x = 192,206,092.90
  5. Step 5: Solve for x
    x = 192,206,092.90/15,855.21
  6. Step 6: Final answer
    x = 12,122.58

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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.