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Finding the Fourth Proportional to 139,430.51, 192,413.59 and 79,012.66

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Solution

The fourth proportional to 139,430.51, 192,413.59 and 79,012.66 is: 109,037.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,430.51 : 192,413.59 = 79,012.66 : x
  2. Step 2: Convert to fraction form
    139,430.51/192,413.59 = 79,012.66/x
  3. Step 3: Cross multiply
    139,430.51x = 192,413.59 × 79,012.66
  4. Step 4: Simplify right side
    139,430.51x = 15,203,109,566.05
  5. Step 5: Solve for x
    x = 15,203,109,566.05/139,430.51
  6. Step 6: Final answer
    x = 109,037.18

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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.