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Finding the Fourth Proportional to 203,512.15, 305,195.32 and 103,639.15

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Solution

The fourth proportional to 203,512.15, 305,195.32 and 103,639.15 is: 155,421.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,512.15 : 305,195.32 = 103,639.15 : x
  2. Step 2: Convert to fraction form
    203,512.15/305,195.32 = 103,639.15/x
  3. Step 3: Cross multiply
    203,512.15x = 305,195.32 × 103,639.15
  4. Step 4: Simplify right side
    203,512.15x = 31,630,183,548.78
  5. Step 5: Solve for x
    x = 31,630,183,548.78/203,512.15
  6. Step 6: Final answer
    x = 155,421.60

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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.