Home / 15,855.20-21,880.12-8,781.62

Finding the Fourth Proportional to 15,855.20, 21,880.12 and 8,781.62

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Solution

The fourth proportional to 15,855.20, 21,880.12 and 8,781.62 is: 12,118.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.20 : 21,880.12 = 8,781.62 : x
  2. Step 2: Convert to fraction form
    15,855.20/21,880.12 = 8,781.62/x
  3. Step 3: Cross multiply
    15,855.20x = 21,880.12 × 8,781.62
  4. Step 4: Simplify right side
    15,855.20x = 192,142,746.09
  5. Step 5: Solve for x
    x = 192,142,746.09/15,855.20
  6. Step 6: Final answer
    x = 12,118.60

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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.