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Finding the Fourth Proportional to 940.96, 1,413.60 and 815.68

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Solution

The fourth proportional to 940.96, 1,413.60 and 815.68 is: 1,225.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.96 : 1,413.60 = 815.68 : x
  2. Step 2: Convert to fraction form
    940.96/1,413.60 = 815.68/x
  3. Step 3: Cross multiply
    940.96x = 1,413.60 × 815.68
  4. Step 4: Simplify right side
    940.96x = 1,153,045.25
  5. Step 5: Solve for x
    x = 1,153,045.25/940.96
  6. Step 6: Final answer
    x = 1,225.39

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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.