Home / 21,115.50-29,139.39-11,685.48

Finding the Fourth Proportional to 21,115.50, 29,139.39 and 11,685.48

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Solution

The fourth proportional to 21,115.50, 29,139.39 and 11,685.48 is: 16,125.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.50 : 29,139.39 = 11,685.48 : x
  2. Step 2: Convert to fraction form
    21,115.50/29,139.39 = 11,685.48/x
  3. Step 3: Cross multiply
    21,115.50x = 29,139.39 × 11,685.48
  4. Step 4: Simplify right side
    21,115.50x = 340,507,759.06
  5. Step 5: Solve for x
    x = 340,507,759.06/21,115.50
  6. Step 6: Final answer
    x = 16,125.96

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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.