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Finding the Fourth Proportional to 718,256.85, 991,200.86 and 395,978.28

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Solution

The fourth proportional to 718,256.85, 991,200.86 and 395,978.28 is: 546,453.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,256.85 : 991,200.86 = 395,978.28 : x
  2. Step 2: Convert to fraction form
    718,256.85/991,200.86 = 395,978.28/x
  3. Step 3: Cross multiply
    718,256.85x = 991,200.86 × 395,978.28
  4. Step 4: Simplify right side
    718,256.85x = 392,494,009,697.43
  5. Step 5: Solve for x
    x = 392,494,009,697.43/718,256.85
  6. Step 6: Final answer
    x = 546,453.56

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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.