Home / 21,688.52-29,930.48-12,129.44

Finding the Fourth Proportional to 21,688.52, 29,930.48 and 12,129.44

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Solution

The fourth proportional to 21,688.52, 29,930.48 and 12,129.44 is: 16,738.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,688.52 : 29,930.48 = 12,129.44 : x
  2. Step 2: Convert to fraction form
    21,688.52/29,930.48 = 12,129.44/x
  3. Step 3: Cross multiply
    21,688.52x = 29,930.48 × 12,129.44
  4. Step 4: Simplify right side
    21,688.52x = 363,039,961.33
  5. Step 5: Solve for x
    x = 363,039,961.33/21,688.52
  6. Step 6: Final answer
    x = 16,738.81

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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.