Home / 20,388.78-28,143.52-12,847.82

Finding the Fourth Proportional to 20,388.78, 28,143.52 and 12,847.82

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Solution

The fourth proportional to 20,388.78, 28,143.52 and 12,847.82 is: 17,734.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,388.78 : 28,143.52 = 12,847.82 : x
  2. Step 2: Convert to fraction form
    20,388.78/28,143.52 = 12,847.82/x
  3. Step 3: Cross multiply
    20,388.78x = 28,143.52 × 12,847.82
  4. Step 4: Simplify right side
    20,388.78x = 361,582,706.29
  5. Step 5: Solve for x
    x = 361,582,706.29/20,388.78
  6. Step 6: Final answer
    x = 17,734.40

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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.