Home / 20,936.20-28,886.10-12,978.76

Finding the Fourth Proportional to 20,936.20, 28,886.10 and 12,978.76

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Solution

The fourth proportional to 20,936.20, 28,886.10 and 12,978.76 is: 17,907.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,936.20 : 28,886.10 = 12,978.76 : x
  2. Step 2: Convert to fraction form
    20,936.20/28,886.10 = 12,978.76/x
  3. Step 3: Cross multiply
    20,936.20x = 28,886.10 × 12,978.76
  4. Step 4: Simplify right side
    20,936.20x = 374,905,759.24
  5. Step 5: Solve for x
    x = 374,905,759.24/20,936.20
  6. Step 6: Final answer
    x = 17,907.06

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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.