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Finding the Fourth Proportional to 408,979.20, 613,929.60 and 315,897.60

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Solution

The fourth proportional to 408,979.20, 613,929.60 and 315,897.60 is: 474,202.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,979.20 : 613,929.60 = 315,897.60 : x
  2. Step 2: Convert to fraction form
    408,979.20/613,929.60 = 315,897.60/x
  3. Step 3: Cross multiply
    408,979.20x = 613,929.60 × 315,897.60
  4. Step 4: Simplify right side
    408,979.20x = 193,938,887,208.96
  5. Step 5: Solve for x
    x = 193,938,887,208.96/408,979.20
  6. Step 6: Final answer
    x = 474,202.32

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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.