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Finding the Fourth Proportional to 705,387.90, 973,498.77 and 399,538.67

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Solution

The fourth proportional to 705,387.90, 973,498.77 and 399,538.67 is: 551,399.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    705,387.90 : 973,498.77 = 399,538.67 : x
  2. Step 2: Convert to fraction form
    705,387.90/973,498.77 = 399,538.67/x
  3. Step 3: Cross multiply
    705,387.90x = 973,498.77 × 399,538.67
  4. Step 4: Simplify right side
    705,387.90x = 388,950,398,944.94
  5. Step 5: Solve for x
    x = 388,950,398,944.94/705,387.90
  6. Step 6: Final answer
    x = 551,399.31

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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.