Home / 80,918.10-121,413.60-38,781.90

Finding the Fourth Proportional to 80,918.10, 121,413.60 and 38,781.90

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Solution

The fourth proportional to 80,918.10, 121,413.60 and 38,781.90 is: 58,190.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,918.10 : 121,413.60 = 38,781.90 : x
  2. Step 2: Convert to fraction form
    80,918.10/121,413.60 = 38,781.90/x
  3. Step 3: Cross multiply
    80,918.10x = 121,413.60 × 38,781.90
  4. Step 4: Simplify right side
    80,918.10x = 4,708,650,093.84
  5. Step 5: Solve for x
    x = 4,708,650,093.84/80,918.10
  6. Step 6: Final answer
    x = 58,190.32

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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.