Home / 21,115.78-29,115.93-15,793.54

Finding the Fourth Proportional to 21,115.78, 29,115.93 and 15,793.54

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Solution

The fourth proportional to 21,115.78, 29,115.93 and 15,793.54 is: 21,777.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.78 : 29,115.93 = 15,793.54 : x
  2. Step 2: Convert to fraction form
    21,115.78/29,115.93 = 15,793.54/x
  3. Step 3: Cross multiply
    21,115.78x = 29,115.93 × 15,793.54
  4. Step 4: Simplify right side
    21,115.78x = 459,843,605.09
  5. Step 5: Solve for x
    x = 459,843,605.09/21,115.78
  6. Step 6: Final answer
    x = 21,777.25

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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.