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Finding the Fourth Proportional to 681.07, 939.53 and 445.16

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Solution

The fourth proportional to 681.07, 939.53 and 445.16 is: 614.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.07 : 939.53 = 445.16 : x
  2. Step 2: Convert to fraction form
    681.07/939.53 = 445.16/x
  3. Step 3: Cross multiply
    681.07x = 939.53 × 445.16
  4. Step 4: Simplify right side
    681.07x = 418,239.94
  5. Step 5: Solve for x
    x = 418,239.94/681.07
  6. Step 6: Final answer
    x = 614.09

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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.