Home / 21,115.28-28,983.86-18,671.70

Finding the Fourth Proportional to 21,115.28, 28,983.86 and 18,671.70

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Solution

The fourth proportional to 21,115.28, 28,983.86 and 18,671.70 is: 25,629.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.28 : 28,983.86 = 18,671.70 : x
  2. Step 2: Convert to fraction form
    21,115.28/28,983.86 = 18,671.70/x
  3. Step 3: Cross multiply
    21,115.28x = 28,983.86 × 18,671.70
  4. Step 4: Simplify right side
    21,115.28x = 541,177,845.40
  5. Step 5: Solve for x
    x = 541,177,845.40/21,115.28
  6. Step 6: Final answer
    x = 25,629.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.