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Finding the Fourth Proportional to 338,940.60, 508,413.81 and 86,221.31

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Solution

The fourth proportional to 338,940.60, 508,413.81 and 86,221.31 is: 129,332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,940.60 : 508,413.81 = 86,221.31 : x
  2. Step 2: Convert to fraction form
    338,940.60/508,413.81 = 86,221.31/x
  3. Step 3: Cross multiply
    338,940.60x = 508,413.81 × 86,221.31
  4. Step 4: Simplify right side
    338,940.60x = 43,836,102,178.22
  5. Step 5: Solve for x
    x = 43,836,102,178.22/338,940.60
  6. Step 6: Final answer
    x = 129,332.70

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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.