Home / 21,090.71-29,105.19-12,138.05

Finding the Fourth Proportional to 21,090.71, 29,105.19 and 12,138.05

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Solution

The fourth proportional to 21,090.71, 29,105.19 and 12,138.05 is: 16,750.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.71 : 29,105.19 = 12,138.05 : x
  2. Step 2: Convert to fraction form
    21,090.71/29,105.19 = 12,138.05/x
  3. Step 3: Cross multiply
    21,090.71x = 29,105.19 × 12,138.05
  4. Step 4: Simplify right side
    21,090.71x = 353,280,105.95
  5. Step 5: Solve for x
    x = 353,280,105.95/21,090.71
  6. Step 6: Final answer
    x = 16,750.51

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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.