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Finding the Fourth Proportional to 78,413.60, 117,620.40 and 67,138.40

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Solution

The fourth proportional to 78,413.60, 117,620.40 and 67,138.40 is: 100,707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,413.60 : 117,620.40 = 67,138.40 : x
  2. Step 2: Convert to fraction form
    78,413.60/117,620.40 = 67,138.40/x
  3. Step 3: Cross multiply
    78,413.60x = 117,620.40 × 67,138.40
  4. Step 4: Simplify right side
    78,413.60x = 7,896,845,463.36
  5. Step 5: Solve for x
    x = 7,896,845,463.36/78,413.60
  6. Step 6: Final answer
    x = 100,707.60

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1.5x scale

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.