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Finding the Fourth Proportional to 203,511.15, 305,193.82 and 103,638.15

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Solution

The fourth proportional to 203,511.15, 305,193.82 and 103,638.15 is: 155,420.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,511.15 : 305,193.82 = 103,638.15 : x
  2. Step 2: Convert to fraction form
    203,511.15/305,193.82 = 103,638.15/x
  3. Step 3: Cross multiply
    203,511.15x = 305,193.82 × 103,638.15
  4. Step 4: Simplify right side
    203,511.15x = 31,629,722,896.23
  5. Step 5: Solve for x
    x = 31,629,722,896.23/203,511.15
  6. Step 6: Final answer
    x = 155,420.10

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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.