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Finding the Fourth Proportional to 85,602.40, 128,403.60 and 57,608.80

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Solution

The fourth proportional to 85,602.40, 128,403.60 and 57,608.80 is: 86,413.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,602.40 : 128,403.60 = 57,608.80 : x
  2. Step 2: Convert to fraction form
    85,602.40/128,403.60 = 57,608.80/x
  3. Step 3: Cross multiply
    85,602.40x = 128,403.60 × 57,608.80
  4. Step 4: Simplify right side
    85,602.40x = 7,397,177,311.68
  5. Step 5: Solve for x
    x = 7,397,177,311.68/85,602.40
  6. Step 6: Final answer
    x = 86,413.20

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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.