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Finding the Fourth Proportional to 128,530.70, 192,738.45 and 49,618.70

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Solution

The fourth proportional to 128,530.70, 192,738.45 and 49,618.70 is: 74,405.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.70 : 192,738.45 = 49,618.70 : x
  2. Step 2: Convert to fraction form
    128,530.70/192,738.45 = 49,618.70/x
  3. Step 3: Cross multiply
    128,530.70x = 192,738.45 × 49,618.70
  4. Step 4: Simplify right side
    128,530.70x = 9,563,431,329.02
  5. Step 5: Solve for x
    x = 9,563,431,329.02/128,530.70
  6. Step 6: Final answer
    x = 74,405.81

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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.