Home / 21,837.20-30,135.36-12,884.72

Finding the Fourth Proportional to 21,837.20, 30,135.36 and 12,884.72

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Solution

The fourth proportional to 21,837.20, 30,135.36 and 12,884.72 is: 17,780.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,837.20 : 30,135.36 = 12,884.72 : x
  2. Step 2: Convert to fraction form
    21,837.20/30,135.36 = 12,884.72/x
  3. Step 3: Cross multiply
    21,837.20x = 30,135.36 × 12,884.72
  4. Step 4: Simplify right side
    21,837.20x = 388,285,675.70
  5. Step 5: Solve for x
    x = 388,285,675.70/21,837.20
  6. Step 6: Final answer
    x = 17,780.93

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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.