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Finding the Fourth Proportional to 12,205.78, 18,308.70 and 2,971.78

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Solution

The fourth proportional to 12,205.78, 18,308.70 and 2,971.78 is: 4,457.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,205.78 : 18,308.70 = 2,971.78 : x
  2. Step 2: Convert to fraction form
    12,205.78/18,308.70 = 2,971.78/x
  3. Step 3: Cross multiply
    12,205.78x = 18,308.70 × 2,971.78
  4. Step 4: Simplify right side
    12,205.78x = 54,409,428.49
  5. Step 5: Solve for x
    x = 54,409,428.49/12,205.78
  6. Step 6: Final answer
    x = 4,457.68

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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.