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Finding the Fourth Proportional to 258,718.60, 388,118.94 and 81,186.04

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Solution

The fourth proportional to 258,718.60, 388,118.94 and 81,186.04 is: 121,791.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,718.60 : 388,118.94 = 81,186.04 : x
  2. Step 2: Convert to fraction form
    258,718.60/388,118.94 = 81,186.04/x
  3. Step 3: Cross multiply
    258,718.60x = 388,118.94 × 81,186.04
  4. Step 4: Simplify right side
    258,718.60x = 31,509,839,787.60
  5. Step 5: Solve for x
    x = 31,509,839,787.60/258,718.60
  6. Step 6: Final answer
    x = 121,791.94

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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.