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Finding the Fourth Proportional to 258,830.88, 388,339.73 and 90,376.02

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Solution

The fourth proportional to 258,830.88, 388,339.73 and 90,376.02 is: 135,596.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,830.88 : 388,339.73 = 90,376.02 : x
  2. Step 2: Convert to fraction form
    258,830.88/388,339.73 = 90,376.02/x
  3. Step 3: Cross multiply
    258,830.88x = 388,339.73 × 90,376.02
  4. Step 4: Simplify right side
    258,830.88x = 35,096,599,205.27
  5. Step 5: Solve for x
    x = 35,096,599,205.27/258,830.88
  6. Step 6: Final answer
    x = 135,596.65

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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.