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Finding the Fourth Proportional to 338,716.15, 508,074.46 and 86,015.59

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Solution

The fourth proportional to 338,716.15, 508,074.46 and 86,015.59 is: 129,023.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,716.15 : 508,074.46 = 86,015.59 : x
  2. Step 2: Convert to fraction form
    338,716.15/508,074.46 = 86,015.59/x
  3. Step 3: Cross multiply
    338,716.15x = 508,074.46 × 86,015.59
  4. Step 4: Simplify right side
    338,716.15x = 43,702,322,955.61
  5. Step 5: Solve for x
    x = 43,702,322,955.61/338,716.15
  6. Step 6: Final answer
    x = 129,023.44

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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.