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Finding the Fourth Proportional to 85,725.80, 128,661.60 and 38,413.70

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Solution

The fourth proportional to 85,725.80, 128,661.60 and 38,413.70 is: 57,653.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,725.80 : 128,661.60 = 38,413.70 : x
  2. Step 2: Convert to fraction form
    85,725.80/128,661.60 = 38,413.70/x
  3. Step 3: Cross multiply
    85,725.80x = 128,661.60 × 38,413.70
  4. Step 4: Simplify right side
    85,725.80x = 4,942,368,103.92
  5. Step 5: Solve for x
    x = 4,942,368,103.92/85,725.80
  6. Step 6: Final answer
    x = 57,653.22

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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.