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Finding the Fourth Proportional to 489,920.40, 734,880.60 and 321,958.80

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Solution

The fourth proportional to 489,920.40, 734,880.60 and 321,958.80 is: 482,938.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,920.40 : 734,880.60 = 321,958.80 : x
  2. Step 2: Convert to fraction form
    489,920.40/734,880.60 = 321,958.80/x
  3. Step 3: Cross multiply
    489,920.40x = 734,880.60 × 321,958.80
  4. Step 4: Simplify right side
    489,920.40x = 236,601,276,119.28
  5. Step 5: Solve for x
    x = 236,601,276,119.28/489,920.40
  6. Step 6: Final answer
    x = 482,938.20

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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.