Home / 15,855.32-21,880.29-8,781.74

Finding the Fourth Proportional to 15,855.32, 21,880.29 and 8,781.74

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Solution

The fourth proportional to 15,855.32, 21,880.29 and 8,781.74 is: 12,118.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.32 : 21,880.29 = 8,781.74 : x
  2. Step 2: Convert to fraction form
    15,855.32/21,880.29 = 8,781.74/x
  3. Step 3: Cross multiply
    15,855.32x = 21,880.29 × 8,781.74
  4. Step 4: Simplify right side
    15,855.32x = 192,147,017.90
  5. Step 5: Solve for x
    x = 192,147,017.90/15,855.32
  6. Step 6: Final answer
    x = 12,118.77

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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.