Home / 15,780.15-21,775.61-8,706.62

Finding the Fourth Proportional to 15,780.15, 21,775.61 and 8,706.62

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Solution

The fourth proportional to 15,780.15, 21,775.61 and 8,706.62 is: 12,014.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.15 : 21,775.61 = 8,706.62 : x
  2. Step 2: Convert to fraction form
    15,780.15/21,775.61 = 8,706.62/x
  3. Step 3: Cross multiply
    15,780.15x = 21,775.61 × 8,706.62
  4. Step 4: Simplify right side
    15,780.15x = 189,591,961.54
  5. Step 5: Solve for x
    x = 189,591,961.54/15,780.15
  6. Step 6: Final answer
    x = 12,014.59

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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.