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Finding the Fourth Proportional to 919,968, 1,379,952 and 255,120

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Solution

The fourth proportional to 919,968, 1,379,952 and 255,120 is: 382,680

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,968 : 1,379,952 = 255,120 : x
  2. Step 2: Convert to fraction form
    919,968/1,379,952 = 255,120/x
  3. Step 3: Cross multiply
    919,968x = 1,379,952 × 255,120
  4. Step 4: Simplify right side
    919,968x = 352,053,354,240
  5. Step 5: Solve for x
    x = 352,053,354,240/919,968
  6. Step 6: Final answer
    x = 382,680

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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.