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Finding the Fourth Proportional to 338,719, 508,078.74 and 86,018.44

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Solution

The fourth proportional to 338,719, 508,078.74 and 86,018.44 is: 129,027.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,719 : 508,078.74 = 86,018.44 : x
  2. Step 2: Convert to fraction form
    338,719/508,078.74 = 86,018.44/x
  3. Step 3: Cross multiply
    338,719x = 508,078.74 × 86,018.44
  4. Step 4: Simplify right side
    338,719x = 43,704,140,611.97
  5. Step 5: Solve for x
    x = 43,704,140,611.97/338,719
  6. Step 6: Final answer
    x = 129,027.72

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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.