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Finding the Fourth Proportional to 938.64, 1,413.59 and 855.60

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Solution

The fourth proportional to 938.64, 1,413.59 and 855.60 is: 1,288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.64 : 1,413.59 = 855.60 : x
  2. Step 2: Convert to fraction form
    938.64/1,413.59 = 855.60/x
  3. Step 3: Cross multiply
    938.64x = 1,413.59 × 855.60
  4. Step 4: Simplify right side
    938.64x = 1,209,467.60
  5. Step 5: Solve for x
    x = 1,209,467.60/938.64
  6. Step 6: Final answer
    x = 1,288.53

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.