Home / 20,811.78-28,735.30-12,864.90

Finding the Fourth Proportional to 20,811.78, 28,735.30 and 12,864.90

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Solution

The fourth proportional to 20,811.78, 28,735.30 and 12,864.90 is: 17,762.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.78 : 28,735.30 = 12,864.90 : x
  2. Step 2: Convert to fraction form
    20,811.78/28,735.30 = 12,864.90/x
  3. Step 3: Cross multiply
    20,811.78x = 28,735.30 × 12,864.90
  4. Step 4: Simplify right side
    20,811.78x = 369,676,760.97
  5. Step 5: Solve for x
    x = 369,676,760.97/20,811.78
  6. Step 6: Final answer
    x = 17,762.86

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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.