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Finding the Fourth Proportional to 386,413.80, 519,999.75 and 386,413.80

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Solution

The fourth proportional to 386,413.80, 519,999.75 and 386,413.80 is: 519,999.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,413.80 : 519,999.75 = 386,413.80 : x
  2. Step 2: Convert to fraction form
    386,413.80/519,999.75 = 386,413.80/x
  3. Step 3: Cross multiply
    386,413.80x = 519,999.75 × 386,413.80
  4. Step 4: Simplify right side
    386,413.80x = 200,935,079,396.55
  5. Step 5: Solve for x
    x = 200,935,079,396.55/386,413.80
  6. Step 6: Final answer
    x = 519,999.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.