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Finding the Fourth Proportional to 136,927.60, 188,859 and 86,578

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Solution

The fourth proportional to 136,927.60, 188,859 and 86,578 is: 119,413.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,927.60 : 188,859 = 86,578 : x
  2. Step 2: Convert to fraction form
    136,927.60/188,859 = 86,578/x
  3. Step 3: Cross multiply
    136,927.60x = 188,859 × 86,578
  4. Step 4: Simplify right side
    136,927.60x = 16,351,034,502
  5. Step 5: Solve for x
    x = 16,351,034,502/136,927.60
  6. Step 6: Final answer
    x = 119,413.72

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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.