Home / 20,400.78-28,160.10-12,859.80

Finding the Fourth Proportional to 20,400.78, 28,160.10 and 12,859.80

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Solution

The fourth proportional to 20,400.78, 28,160.10 and 12,859.80 is: 17,750.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400.78 : 28,160.10 = 12,859.80 : x
  2. Step 2: Convert to fraction form
    20,400.78/28,160.10 = 12,859.80/x
  3. Step 3: Cross multiply
    20,400.78x = 28,160.10 × 12,859.80
  4. Step 4: Simplify right side
    20,400.78x = 362,133,253.98
  5. Step 5: Solve for x
    x = 362,133,253.98/20,400.78
  6. Step 6: Final answer
    x = 17,750.95

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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.