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Finding the Fourth Proportional to 61,142.72, 84,413.76 and 39,957.44

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Solution

The fourth proportional to 61,142.72, 84,413.76 and 39,957.44 is: 55,165.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,142.72 : 84,413.76 = 39,957.44 : x
  2. Step 2: Convert to fraction form
    61,142.72/84,413.76 = 39,957.44/x
  3. Step 3: Cross multiply
    61,142.72x = 84,413.76 × 39,957.44
  4. Step 4: Simplify right side
    61,142.72x = 3,372,957,750.37
  5. Step 5: Solve for x
    x = 3,372,957,750.37/61,142.72
  6. Step 6: Final answer
    x = 55,165.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.