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Finding the Fourth Proportional to 685,804.53, 946,425.50 and 391,448.31

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Solution

The fourth proportional to 685,804.53, 946,425.50 and 391,448.31 is: 540,207.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,804.53 : 946,425.50 = 391,448.31 : x
  2. Step 2: Convert to fraction form
    685,804.53/946,425.50 = 391,448.31/x
  3. Step 3: Cross multiply
    685,804.53x = 946,425.50 × 391,448.31
  4. Step 4: Simplify right side
    685,804.53x = 370,476,658,477.50
  5. Step 5: Solve for x
    x = 370,476,658,477.50/685,804.53
  6. Step 6: Final answer
    x = 540,207.36

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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.