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Finding the Fourth Proportional to 218,961.33, 328,413.69 and 69,216.72

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Solution

The fourth proportional to 218,961.33, 328,413.69 and 69,216.72 is: 103,816.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,961.33 : 328,413.69 = 69,216.72 : x
  2. Step 2: Convert to fraction form
    218,961.33/328,413.69 = 69,216.72/x
  3. Step 3: Cross multiply
    218,961.33x = 328,413.69 × 69,216.72
  4. Step 4: Simplify right side
    218,961.33x = 22,731,718,424.90
  5. Step 5: Solve for x
    x = 22,731,718,424.90/218,961.33
  6. Step 6: Final answer
    x = 103,816.13

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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.