Home / 21,186.37-29,238.11-12,689.87

Finding the Fourth Proportional to 21,186.37, 29,238.11 and 12,689.87

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Solution

The fourth proportional to 21,186.37, 29,238.11 and 12,689.87 is: 17,512.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.37 : 29,238.11 = 12,689.87 : x
  2. Step 2: Convert to fraction form
    21,186.37/29,238.11 = 12,689.87/x
  3. Step 3: Cross multiply
    21,186.37x = 29,238.11 × 12,689.87
  4. Step 4: Simplify right side
    21,186.37x = 371,027,824.59
  5. Step 5: Solve for x
    x = 371,027,824.59/21,186.37
  6. Step 6: Final answer
    x = 17,512.57

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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.