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Finding the Fourth Proportional to 18,383.90, 25,392.91 and 15,165.38

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Solution

The fourth proportional to 18,383.90, 25,392.91 and 15,165.38 is: 20,947.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,383.90 : 25,392.91 = 15,165.38 : x
  2. Step 2: Convert to fraction form
    18,383.90/25,392.91 = 15,165.38/x
  3. Step 3: Cross multiply
    18,383.90x = 25,392.91 × 15,165.38
  4. Step 4: Simplify right side
    18,383.90x = 385,093,129.46
  5. Step 5: Solve for x
    x = 385,093,129.46/18,383.90
  6. Step 6: Final answer
    x = 20,947.30

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Double scale
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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.