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Finding the Fourth Proportional to 942.39, 1,413.59 and 394.56

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Solution

The fourth proportional to 942.39, 1,413.59 and 394.56 is: 591.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.39 : 1,413.59 = 394.56 : x
  2. Step 2: Convert to fraction form
    942.39/1,413.59 = 394.56/x
  3. Step 3: Cross multiply
    942.39x = 1,413.59 × 394.56
  4. Step 4: Simplify right side
    942.39x = 557,744.10
  5. Step 5: Solve for x
    x = 557,744.10/942.39
  6. Step 6: Final answer
    x = 591.84

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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.