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Finding the Fourth Proportional to 338,965.77, 508,249.31 and 128,618.49

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Solution

The fourth proportional to 338,965.77, 508,249.31 and 128,618.49 is: 192,852.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,965.77 : 508,249.31 = 128,618.49 : x
  2. Step 2: Convert to fraction form
    338,965.77/508,249.31 = 128,618.49/x
  3. Step 3: Cross multiply
    338,965.77x = 508,249.31 × 128,618.49
  4. Step 4: Simplify right side
    338,965.77x = 65,370,258,152.65
  5. Step 5: Solve for x
    x = 65,370,258,152.65/338,965.77
  6. Step 6: Final answer
    x = 192,852.09

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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.