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Finding the Fourth Proportional to 18,684.78, 25,961.93 and 18,489.77

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Solution

The fourth proportional to 18,684.78, 25,961.93 and 18,489.77 is: 25,690.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,684.78 : 25,961.93 = 18,489.77 : x
  2. Step 2: Convert to fraction form
    18,684.78/25,961.93 = 18,489.77/x
  3. Step 3: Cross multiply
    18,684.78x = 25,961.93 × 18,489.77
  4. Step 4: Simplify right side
    18,684.78x = 480,030,114.46
  5. Step 5: Solve for x
    x = 480,030,114.46/18,684.78
  6. Step 6: Final answer
    x = 25,690.97

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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 (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.