Home / 715,923.14-987,974.61-393,638.72

Finding the Fourth Proportional to 715,923.14, 987,974.61 and 393,638.72

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Solution

The fourth proportional to 715,923.14, 987,974.61 and 393,638.72 is: 543,221.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,923.14 : 987,974.61 = 393,638.72 : x
  2. Step 2: Convert to fraction form
    715,923.14/987,974.61 = 393,638.72/x
  3. Step 3: Cross multiply
    715,923.14x = 987,974.61 × 393,638.72
  4. Step 4: Simplify right side
    715,923.14x = 388,905,060,872.90
  5. Step 5: Solve for x
    x = 388,905,060,872.90/715,923.14
  6. Step 6: Final answer
    x = 543,221.81

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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.