Home / 81,331.40-121,997.10-31,413.80

Finding the Fourth Proportional to 81,331.40, 121,997.10 and 31,413.80

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Solution

The fourth proportional to 81,331.40, 121,997.10 and 31,413.80 is: 47,120.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,331.40 : 121,997.10 = 31,413.80 : x
  2. Step 2: Convert to fraction form
    81,331.40/121,997.10 = 31,413.80/x
  3. Step 3: Cross multiply
    81,331.40x = 121,997.10 × 31,413.80
  4. Step 4: Simplify right side
    81,331.40x = 3,832,392,499.98
  5. Step 5: Solve for x
    x = 3,832,392,499.98/81,331.40
  6. Step 6: Final answer
    x = 47,120.70

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1.5x scale

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.