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Finding the Fourth Proportional to 789.15, 1,088.85 and 602.85

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Solution

The fourth proportional to 789.15, 1,088.85 and 602.85 is: 831.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.15 : 1,088.85 = 602.85 : x
  2. Step 2: Convert to fraction form
    789.15/1,088.85 = 602.85/x
  3. Step 3: Cross multiply
    789.15x = 1,088.85 × 602.85
  4. Step 4: Simplify right side
    789.15x = 656,413.22
  5. Step 5: Solve for x
    x = 656,413.22/789.15
  6. Step 6: Final answer
    x = 831.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.