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Finding the Fourth Proportional to 128,424.20, 192,578.70 and 49,512.20

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Solution

The fourth proportional to 128,424.20, 192,578.70 and 49,512.20 is: 74,246.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,424.20 : 192,578.70 = 49,512.20 : x
  2. Step 2: Convert to fraction form
    128,424.20/192,578.70 = 49,512.20/x
  3. Step 3: Cross multiply
    128,424.20x = 192,578.70 × 49,512.20
  4. Step 4: Simplify right side
    128,424.20x = 9,534,995,110.14
  5. Step 5: Solve for x
    x = 9,534,995,110.14/128,424.20
  6. Step 6: Final answer
    x = 74,246.09

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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.