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Finding the Fourth Proportional to 258,878.94, 388,335.16 and 81,392.82

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Solution

The fourth proportional to 258,878.94, 388,335.16 and 81,392.82 is: 122,094.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,878.94 : 388,335.16 = 81,392.82 : x
  2. Step 2: Convert to fraction form
    258,878.94/388,335.16 = 81,392.82/x
  3. Step 3: Cross multiply
    258,878.94x = 388,335.16 × 81,392.82
  4. Step 4: Simplify right side
    258,878.94x = 31,607,693,777.55
  5. Step 5: Solve for x
    x = 31,607,693,777.55/258,878.94
  6. Step 6: Final answer
    x = 122,094.50

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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.