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Finding the Fourth Proportional to 18,697.49, 25,805.33 and 11,990.69

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Solution

The fourth proportional to 18,697.49, 25,805.33 and 11,990.69 is: 16,548.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,697.49 : 25,805.33 = 11,990.69 : x
  2. Step 2: Convert to fraction form
    18,697.49/25,805.33 = 11,990.69/x
  3. Step 3: Cross multiply
    18,697.49x = 25,805.33 × 11,990.69
  4. Step 4: Simplify right side
    18,697.49x = 309,423,712.38
  5. Step 5: Solve for x
    x = 309,423,712.38/18,697.49
  6. Step 6: Final answer
    x = 16,548.94

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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.