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Finding the Fourth Proportional to 919,980, 1,379,970 and 255,132

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Solution

The fourth proportional to 919,980, 1,379,970 and 255,132 is: 382,698

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,980 : 1,379,970 = 255,132 : x
  2. Step 2: Convert to fraction form
    919,980/1,379,970 = 255,132/x
  3. Step 3: Cross multiply
    919,980x = 1,379,970 × 255,132
  4. Step 4: Simplify right side
    919,980x = 352,074,506,040
  5. Step 5: Solve for x
    x = 352,074,506,040/919,980
  6. Step 6: Final answer
    x = 382,698

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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.