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Finding the Fourth Proportional to 255,905.88, 353,137.79 and 139,612.43

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Solution

The fourth proportional to 255,905.88, 353,137.79 and 139,612.43 is: 192,658.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,905.88 : 353,137.79 = 139,612.43 : x
  2. Step 2: Convert to fraction form
    255,905.88/353,137.79 = 139,612.43/x
  3. Step 3: Cross multiply
    255,905.88x = 353,137.79 × 139,612.43
  4. Step 4: Simplify right side
    255,905.88x = 49,302,424,986.73
  5. Step 5: Solve for x
    x = 49,302,424,986.73/255,905.88
  6. Step 6: Final answer
    x = 192,658.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.