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Finding the Fourth Proportional to 717,999.18, 990,819.42 and 395,709.20

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Solution

The fourth proportional to 717,999.18, 990,819.42 and 395,709.20 is: 546,067.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,999.18 : 990,819.42 = 395,709.20 : x
  2. Step 2: Convert to fraction form
    717,999.18/990,819.42 = 395,709.20/x
  3. Step 3: Cross multiply
    717,999.18x = 990,819.42 × 395,709.20
  4. Step 4: Simplify right side
    717,999.18x = 392,076,355,078.57
  5. Step 5: Solve for x
    x = 392,076,355,078.57/717,999.18
  6. Step 6: Final answer
    x = 546,067.97

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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.