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Finding the Fourth Proportional to 86,942.60, 130,413.90 and 60,115.40

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Solution

The fourth proportional to 86,942.60, 130,413.90 and 60,115.40 is: 90,173.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,942.60 : 130,413.90 = 60,115.40 : x
  2. Step 2: Convert to fraction form
    86,942.60/130,413.90 = 60,115.40/x
  3. Step 3: Cross multiply
    86,942.60x = 130,413.90 × 60,115.40
  4. Step 4: Simplify right side
    86,942.60x = 7,839,883,764.06
  5. Step 5: Solve for x
    x = 7,839,883,764.06/86,942.60
  6. Step 6: Final answer
    x = 90,173.10

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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.