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Finding the Fourth Proportional to 37,672, 51,989.79 and 20,905

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Solution

The fourth proportional to 37,672, 51,989.79 and 20,905 is: 28,850.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    37,672 : 51,989.79 = 20,905 : x
  2. Step 2: Convert to fraction form
    37,672/51,989.79 = 20,905/x
  3. Step 3: Cross multiply
    37,672x = 51,989.79 × 20,905
  4. Step 4: Simplify right side
    37,672x = 1,086,846,559.95
  5. Step 5: Solve for x
    x = 1,086,846,559.95/37,672
  6. Step 6: Final answer
    x = 28,850.25

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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.