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Finding the Fourth Proportional to 258,886.86, 388,352.46 and 79,012.78

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Solution

The fourth proportional to 258,886.86, 388,352.46 and 79,012.78 is: 118,525.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,886.86 : 388,352.46 = 79,012.78 : x
  2. Step 2: Convert to fraction form
    258,886.86/388,352.46 = 79,012.78/x
  3. Step 3: Cross multiply
    258,886.86x = 388,352.46 × 79,012.78
  4. Step 4: Simplify right side
    258,886.86x = 30,684,807,484.44
  5. Step 5: Solve for x
    x = 30,684,807,484.44/258,886.86
  6. Step 6: Final answer
    x = 118,525.94

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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.