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Finding the Fourth Proportional to 715,956.75, 987,995.03 and 393,664.59

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Solution

The fourth proportional to 715,956.75, 987,995.03 and 393,664.59 is: 543,243.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,956.75 : 987,995.03 = 393,664.59 : x
  2. Step 2: Convert to fraction form
    715,956.75/987,995.03 = 393,664.59/x
  3. Step 3: Cross multiply
    715,956.75x = 987,995.03 × 393,664.59
  4. Step 4: Simplify right side
    715,956.75x = 388,938,656,438.67
  5. Step 5: Solve for x
    x = 388,938,656,438.67/715,956.75
  6. Step 6: Final answer
    x = 543,243.23

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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.