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Finding the Fourth Proportional to 139,413.40, 209,120.10 and 39,563.80

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Solution

The fourth proportional to 139,413.40, 209,120.10 and 39,563.80 is: 59,345.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,413.40 : 209,120.10 = 39,563.80 : x
  2. Step 2: Convert to fraction form
    139,413.40/209,120.10 = 39,563.80/x
  3. Step 3: Cross multiply
    139,413.40x = 209,120.10 × 39,563.80
  4. Step 4: Simplify right side
    139,413.40x = 8,273,585,812.38
  5. Step 5: Solve for x
    x = 8,273,585,812.38/139,413.40
  6. Step 6: Final answer
    x = 59,345.70

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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.