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Finding the Fourth Proportional to 715,955.25, 987,992.96 and 393,663.09

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Solution

The fourth proportional to 715,955.25, 987,992.96 and 393,663.09 is: 543,241.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,955.25 : 987,992.96 = 393,663.09 : x
  2. Step 2: Convert to fraction form
    715,955.25/987,992.96 = 393,663.09/x
  3. Step 3: Cross multiply
    715,955.25x = 987,992.96 × 393,663.09
  4. Step 4: Simplify right side
    715,955.25x = 388,936,359,563.53
  5. Step 5: Solve for x
    x = 388,936,359,563.53/715,955.25
  6. Step 6: Final answer
    x = 543,241.16

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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.