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Finding the Fourth Proportional to 30,480.35, 45,705.94 and 12,940.61

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Solution

The fourth proportional to 30,480.35, 45,705.94 and 12,940.61 is: 19,404.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,480.35 : 45,705.94 = 12,940.61 : x
  2. Step 2: Convert to fraction form
    30,480.35/45,705.94 = 12,940.61/x
  3. Step 3: Cross multiply
    30,480.35x = 45,705.94 × 12,940.61
  4. Step 4: Simplify right side
    30,480.35x = 591,462,483.34
  5. Step 5: Solve for x
    x = 591,462,483.34/30,480.35
  6. Step 6: Final answer
    x = 19,404.72

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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.