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Finding the Fourth Proportional to 942.61, 1,413.83 and 577.21

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Solution

The fourth proportional to 942.61, 1,413.83 and 577.21 is: 865.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.61 : 1,413.83 = 577.21 : x
  2. Step 2: Convert to fraction form
    942.61/1,413.83 = 577.21/x
  3. Step 3: Cross multiply
    942.61x = 1,413.83 × 577.21
  4. Step 4: Simplify right side
    942.61x = 816,073.93
  5. Step 5: Solve for x
    x = 816,073.93/942.61
  6. Step 6: Final answer
    x = 865.76

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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.