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Finding the Fourth Proportional to 399,978, 599,967 and 104,490

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Solution

The fourth proportional to 399,978, 599,967 and 104,490 is: 156,735

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,978 : 599,967 = 104,490 : x
  2. Step 2: Convert to fraction form
    399,978/599,967 = 104,490/x
  3. Step 3: Cross multiply
    399,978x = 599,967 × 104,490
  4. Step 4: Simplify right side
    399,978x = 62,690,551,830
  5. Step 5: Solve for x
    x = 62,690,551,830/399,978
  6. Step 6: Final answer
    x = 156,735

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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.