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Finding the Fourth Proportional to 489,679.20, 734,518.80 and 279,338.40

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Solution

The fourth proportional to 489,679.20, 734,518.80 and 279,338.40 is: 419,007.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,679.20 : 734,518.80 = 279,338.40 : x
  2. Step 2: Convert to fraction form
    489,679.20/734,518.80 = 279,338.40/x
  3. Step 3: Cross multiply
    489,679.20x = 734,518.80 × 279,338.40
  4. Step 4: Simplify right side
    489,679.20x = 205,179,306,361.92
  5. Step 5: Solve for x
    x = 205,179,306,361.92/489,679.20
  6. Step 6: Final answer
    x = 419,007.60

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Similar ratio
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1.5x scale

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.