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Finding the Fourth Proportional to 245,620.32, 338,932 and 138,188

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Solution

The fourth proportional to 245,620.32, 338,932 and 138,188 is: 190,685.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,620.32 : 338,932 = 138,188 : x
  2. Step 2: Convert to fraction form
    245,620.32/338,932 = 138,188/x
  3. Step 3: Cross multiply
    245,620.32x = 338,932 × 138,188
  4. Step 4: Simplify right side
    245,620.32x = 46,836,335,216
  5. Step 5: Solve for x
    x = 46,836,335,216/245,620.32
  6. Step 6: Final answer
    x = 190,685.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.