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Finding the Fourth Proportional to 190,413.20, 285,490.20 and 90,621.20

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Solution

The fourth proportional to 190,413.20, 285,490.20 and 90,621.20 is: 135,870.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,413.20 : 285,490.20 = 90,621.20 : x
  2. Step 2: Convert to fraction form
    190,413.20/285,490.20 = 90,621.20/x
  3. Step 3: Cross multiply
    190,413.20x = 285,490.20 × 90,621.20
  4. Step 4: Simplify right side
    190,413.20x = 25,871,464,512.24
  5. Step 5: Solve for x
    x = 25,871,464,512.24/190,413.20
  6. Step 6: Final answer
    x = 135,870.12

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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.