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Finding the Fourth Proportional to 942.43, 1,413.78 and 455.08

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Solution

The fourth proportional to 942.43, 1,413.78 and 455.08 is: 682.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.43 : 1,413.78 = 455.08 : x
  2. Step 2: Convert to fraction form
    942.43/1,413.78 = 455.08/x
  3. Step 3: Cross multiply
    942.43x = 1,413.78 × 455.08
  4. Step 4: Simplify right side
    942.43x = 643,383.00
  5. Step 5: Solve for x
    x = 643,383.00/942.43
  6. Step 6: Final answer
    x = 682.69

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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.