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Finding the Fourth Proportional to 203,478.40, 305,509.20 and 153,906.40

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Solution

The fourth proportional to 203,478.40, 305,509.20 and 153,906.40 is: 231,080.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,478.40 : 305,509.20 = 153,906.40 : x
  2. Step 2: Convert to fraction form
    203,478.40/305,509.20 = 153,906.40/x
  3. Step 3: Cross multiply
    203,478.40x = 305,509.20 × 153,906.40
  4. Step 4: Simplify right side
    203,478.40x = 47,019,821,138.88
  5. Step 5: Solve for x
    x = 47,019,821,138.88/203,478.40
  6. Step 6: Final answer
    x = 231,080.16

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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.