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Finding the Fourth Proportional to 139,770.80, 192,878.48 and 85,413.86

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Solution

The fourth proportional to 139,770.80, 192,878.48 and 85,413.86 is: 117,867.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,770.80 : 192,878.48 = 85,413.86 : x
  2. Step 2: Convert to fraction form
    139,770.80/192,878.48 = 85,413.86/x
  3. Step 3: Cross multiply
    139,770.80x = 192,878.48 × 85,413.86
  4. Step 4: Simplify right side
    139,770.80x = 16,474,495,487.73
  5. Step 5: Solve for x
    x = 16,474,495,487.73/139,770.80
  6. Step 6: Final answer
    x = 117,867.93

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1.5x scale

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.