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Finding the Fourth Proportional to 90,781.80, 136,172.70 and 86,942.40

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Solution

The fourth proportional to 90,781.80, 136,172.70 and 86,942.40 is: 130,413.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,781.80 : 136,172.70 = 86,942.40 : x
  2. Step 2: Convert to fraction form
    90,781.80/136,172.70 = 86,942.40/x
  3. Step 3: Cross multiply
    90,781.80x = 136,172.70 × 86,942.40
  4. Step 4: Simplify right side
    90,781.80x = 11,839,181,352.48
  5. Step 5: Solve for x
    x = 11,839,181,352.48/90,781.80
  6. Step 6: Final answer
    x = 130,413.60

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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.