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Finding the Fourth Proportional to 718,709.22, 991,814.69 and 396,418.59

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Solution

The fourth proportional to 718,709.22, 991,814.69 and 396,418.59 is: 547,055.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,709.22 : 991,814.69 = 396,418.59 : x
  2. Step 2: Convert to fraction form
    718,709.22/991,814.69 = 396,418.59/x
  3. Step 3: Cross multiply
    718,709.22x = 991,814.69 × 396,418.59
  4. Step 4: Simplify right side
    718,709.22x = 393,173,778,968.99
  5. Step 5: Solve for x
    x = 393,173,778,968.99/718,709.22
  6. Step 6: Final answer
    x = 547,055.43

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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.