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Finding the Fourth Proportional to 617,583.60, 926,375.40 and 428,626.80

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Solution

The fourth proportional to 617,583.60, 926,375.40 and 428,626.80 is: 642,940.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,583.60 : 926,375.40 = 428,626.80 : x
  2. Step 2: Convert to fraction form
    617,583.60/926,375.40 = 428,626.80/x
  3. Step 3: Cross multiply
    617,583.60x = 926,375.40 × 428,626.80
  4. Step 4: Simplify right side
    617,583.60x = 397,069,323,300.72
  5. Step 5: Solve for x
    x = 397,069,323,300.72/617,583.60
  6. Step 6: Final answer
    x = 642,940.20

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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.