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Finding the Fourth Proportional to 128,396.85, 192,580.70 and 49,504.47

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Solution

The fourth proportional to 128,396.85, 192,580.70 and 49,504.47 is: 74,251.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,396.85 : 192,580.70 = 49,504.47 : x
  2. Step 2: Convert to fraction form
    128,396.85/192,580.70 = 49,504.47/x
  3. Step 3: Cross multiply
    128,396.85x = 192,580.70 × 49,504.47
  4. Step 4: Simplify right side
    128,396.85x = 9,533,605,238.21
  5. Step 5: Solve for x
    x = 9,533,605,238.21/128,396.85
  6. Step 6: Final answer
    x = 74,251.08

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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.