Home / 21,138.90-29,171.66-11,707.46

Finding the Fourth Proportional to 21,138.90, 29,171.66 and 11,707.46

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Solution

The fourth proportional to 21,138.90, 29,171.66 and 11,707.46 is: 16,156.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.90 : 29,171.66 = 11,707.46 : x
  2. Step 2: Convert to fraction form
    21,138.90/29,171.66 = 11,707.46/x
  3. Step 3: Cross multiply
    21,138.90x = 29,171.66 × 11,707.46
  4. Step 4: Simplify right side
    21,138.90x = 341,526,042.58
  5. Step 5: Solve for x
    x = 341,526,042.58/21,138.90
  6. Step 6: Final answer
    x = 16,156.28

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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.