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Finding the Fourth Proportional to 138,413.52, 191,010.66 and 74,751.30

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Solution

The fourth proportional to 138,413.52, 191,010.66 and 74,751.30 is: 103,156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,413.52 : 191,010.66 = 74,751.30 : x
  2. Step 2: Convert to fraction form
    138,413.52/191,010.66 = 74,751.30/x
  3. Step 3: Cross multiply
    138,413.52x = 191,010.66 × 74,751.30
  4. Step 4: Simplify right side
    138,413.52x = 14,278,295,148.86
  5. Step 5: Solve for x
    x = 14,278,295,148.86/138,413.52
  6. Step 6: Final answer
    x = 103,156.80

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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.