Home / 715,640.46-987,563.79-393,351.18

Finding the Fourth Proportional to 715,640.46, 987,563.79 and 393,351.18

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Solution

The fourth proportional to 715,640.46, 987,563.79 and 393,351.18 is: 542,813.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,640.46 : 987,563.79 = 393,351.18 : x
  2. Step 2: Convert to fraction form
    715,640.46/987,563.79 = 393,351.18/x
  3. Step 3: Cross multiply
    715,640.46x = 987,563.79 × 393,351.18
  4. Step 4: Simplify right side
    715,640.46x = 388,459,382,121.77
  5. Step 5: Solve for x
    x = 388,459,382,121.77/715,640.46
  6. Step 6: Final answer
    x = 542,813.61

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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.