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Finding the Fourth Proportional to 149,057.50, 205,702.60 and 81,989.50

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Solution

The fourth proportional to 149,057.50, 205,702.60 and 81,989.50 is: 113,147.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,057.50 : 205,702.60 = 81,989.50 : x
  2. Step 2: Convert to fraction form
    149,057.50/205,702.60 = 81,989.50/x
  3. Step 3: Cross multiply
    149,057.50x = 205,702.60 × 81,989.50
  4. Step 4: Simplify right side
    149,057.50x = 16,865,453,322.70
  5. Step 5: Solve for x
    x = 16,865,453,322.70/149,057.50
  6. Step 6: Final answer
    x = 113,147.30

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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.