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Finding the Fourth Proportional to 395,310.86, 545,618.64 and 309,099.32

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Solution

The fourth proportional to 395,310.86, 545,618.64 and 309,099.32 is: 426,627.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,310.86 : 545,618.64 = 309,099.32 : x
  2. Step 2: Convert to fraction form
    395,310.86/545,618.64 = 309,099.32/x
  3. Step 3: Cross multiply
    395,310.86x = 545,618.64 × 309,099.32
  4. Step 4: Simplify right side
    395,310.86x = 168,650,350,603.33
  5. Step 5: Solve for x
    x = 168,650,350,603.33/395,310.86
  6. Step 6: Final answer
    x = 426,627.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.