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Finding the Fourth Proportional to 391,145.70, 540,768.23 and 289,010.07

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Solution

The fourth proportional to 391,145.70, 540,768.23 and 289,010.07 is: 399,563.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,145.70 : 540,768.23 = 289,010.07 : x
  2. Step 2: Convert to fraction form
    391,145.70/540,768.23 = 289,010.07/x
  3. Step 3: Cross multiply
    391,145.70x = 540,768.23 × 289,010.07
  4. Step 4: Simplify right side
    391,145.70x = 156,287,462,561.03
  5. Step 5: Solve for x
    x = 156,287,462,561.03/391,145.70
  6. Step 6: Final answer
    x = 399,563.29

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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.