Home / 21,858.54-30,163.64-12,902.78

Finding the Fourth Proportional to 21,858.54, 30,163.64 and 12,902.78

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Solution

The fourth proportional to 21,858.54, 30,163.64 and 12,902.78 is: 17,805.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,858.54 : 30,163.64 = 12,902.78 : x
  2. Step 2: Convert to fraction form
    21,858.54/30,163.64 = 12,902.78/x
  3. Step 3: Cross multiply
    21,858.54x = 30,163.64 × 12,902.78
  4. Step 4: Simplify right side
    21,858.54x = 389,194,595.59
  5. Step 5: Solve for x
    x = 389,194,595.59/21,858.54
  6. Step 6: Final answer
    x = 17,805.15

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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.