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Finding the Fourth Proportional to 408,887.80, 612,821.40 and 209,287.60

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Solution

The fourth proportional to 408,887.80, 612,821.40 and 209,287.60 is: 313,670.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,887.80 : 612,821.40 = 209,287.60 : x
  2. Step 2: Convert to fraction form
    408,887.80/612,821.40 = 209,287.60/x
  3. Step 3: Cross multiply
    408,887.80x = 612,821.40 × 209,287.60
  4. Step 4: Simplify right side
    408,887.80x = 128,255,920,034.64
  5. Step 5: Solve for x
    x = 128,255,920,034.64/408,887.80
  6. Step 6: Final answer
    x = 313,670.20

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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.