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Finding the Fourth Proportional to 480,738.40, 720,157.20 and 421,640.80

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Solution

The fourth proportional to 480,738.40, 720,157.20 and 421,640.80 is: 631,627.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,738.40 : 720,157.20 = 421,640.80 : x
  2. Step 2: Convert to fraction form
    480,738.40/720,157.20 = 421,640.80/x
  3. Step 3: Cross multiply
    480,738.40x = 720,157.20 × 421,640.80
  4. Step 4: Simplify right side
    480,738.40x = 303,647,657,933.76
  5. Step 5: Solve for x
    x = 303,647,657,933.76/480,738.40
  6. Step 6: Final answer
    x = 631,627.63

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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.