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Finding the Fourth Proportional to 128,771.85, 193,157.78 and 122,210.85

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Solution

The fourth proportional to 128,771.85, 193,157.78 and 122,210.85 is: 183,316.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,771.85 : 193,157.78 = 122,210.85 : x
  2. Step 2: Convert to fraction form
    128,771.85/193,157.78 = 122,210.85/x
  3. Step 3: Cross multiply
    128,771.85x = 193,157.78 × 122,210.85
  4. Step 4: Simplify right side
    128,771.85x = 23,605,975,866.86
  5. Step 5: Solve for x
    x = 23,605,975,866.86/128,771.85
  6. Step 6: Final answer
    x = 183,316.28

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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.