Home / 21,137.12-29,170.12-11,705.68

Finding the Fourth Proportional to 21,137.12, 29,170.12 and 11,705.68

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Solution

The fourth proportional to 21,137.12, 29,170.12 and 11,705.68 is: 16,154.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.12 : 29,170.12 = 11,705.68 : x
  2. Step 2: Convert to fraction form
    21,137.12/29,170.12 = 11,705.68/x
  3. Step 3: Cross multiply
    21,137.12x = 29,170.12 × 11,705.68
  4. Step 4: Simplify right side
    21,137.12x = 341,456,090.28
  5. Step 5: Solve for x
    x = 341,456,090.28/21,137.12
  6. Step 6: Final answer
    x = 16,154.33

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Double scale
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Similar ratio
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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.