Home / 21,165.38-29,201.58-13,212.21

Finding the Fourth Proportional to 21,165.38, 29,201.58 and 13,212.21

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Solution

The fourth proportional to 21,165.38, 29,201.58 and 13,212.21 is: 18,228.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.38 : 29,201.58 = 13,212.21 : x
  2. Step 2: Convert to fraction form
    21,165.38/29,201.58 = 13,212.21/x
  3. Step 3: Cross multiply
    21,165.38x = 29,201.58 × 13,212.21
  4. Step 4: Simplify right side
    21,165.38x = 385,817,461.06
  5. Step 5: Solve for x
    x = 385,817,461.06/21,165.38
  6. Step 6: Final answer
    x = 18,228.71

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Half scale
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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.