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Finding the Fourth Proportional to 86,138.85, 118,878.26 and 51,684.87

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Solution

The fourth proportional to 86,138.85, 118,878.26 and 51,684.87 is: 71,329.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,138.85 : 118,878.26 = 51,684.87 : x
  2. Step 2: Convert to fraction form
    86,138.85/118,878.26 = 51,684.87/x
  3. Step 3: Cross multiply
    86,138.85x = 118,878.26 × 51,684.87
  4. Step 4: Simplify right side
    86,138.85x = 6,144,207,413.93
  5. Step 5: Solve for x
    x = 6,144,207,413.93/86,138.85
  6. Step 6: Final answer
    x = 71,329.11

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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.