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Finding the Fourth Proportional to 717,999.78, 990,820.17 and 395,709.75

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Solution

The fourth proportional to 717,999.78, 990,820.17 and 395,709.75 is: 546,068.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,999.78 : 990,820.17 = 395,709.75 : x
  2. Step 2: Convert to fraction form
    717,999.78/990,820.17 = 395,709.75/x
  3. Step 3: Cross multiply
    717,999.78x = 990,820.17 × 395,709.75
  4. Step 4: Simplify right side
    717,999.78x = 392,077,201,765.66
  5. Step 5: Solve for x
    x = 392,077,201,765.66/717,999.78
  6. Step 6: Final answer
    x = 546,068.69

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1.5x scale

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.