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Finding the Fourth Proportional to 12,745.59, 19,118.39 and 3,981.20

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Solution

The fourth proportional to 12,745.59, 19,118.39 and 3,981.20 is: 5,971.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,745.59 : 19,118.39 = 3,981.20 : x
  2. Step 2: Convert to fraction form
    12,745.59/19,118.39 = 3,981.20/x
  3. Step 3: Cross multiply
    12,745.59x = 19,118.39 × 3,981.20
  4. Step 4: Simplify right side
    12,745.59x = 76,114,018.77
  5. Step 5: Solve for x
    x = 76,114,018.77/12,745.59
  6. Step 6: Final answer
    x = 5,971.79

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