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Finding the Fourth Proportional to 715,958, 987,996.75 and 393,665.84

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Solution

The fourth proportional to 715,958, 987,996.75 and 393,665.84 is: 543,244.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,958 : 987,996.75 = 393,665.84 : x
  2. Step 2: Convert to fraction form
    715,958/987,996.75 = 393,665.84/x
  3. Step 3: Cross multiply
    715,958x = 987,996.75 × 393,665.84
  4. Step 4: Simplify right side
    715,958x = 388,940,570,506.02
  5. Step 5: Solve for x
    x = 388,940,570,506.02/715,958
  6. Step 6: Final answer
    x = 543,244.95

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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.