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Finding the Fourth Proportional to 715,735.58, 987,716.26 and 393,447.72

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Solution

The fourth proportional to 715,735.58, 987,716.26 and 393,447.72 is: 542,958.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,735.58 : 987,716.26 = 393,447.72 : x
  2. Step 2: Convert to fraction form
    715,735.58/987,716.26 = 393,447.72/x
  3. Step 3: Cross multiply
    715,735.58x = 987,716.26 × 393,447.72
  4. Step 4: Simplify right side
    715,735.58x = 388,614,710,503.93
  5. Step 5: Solve for x
    x = 388,614,710,503.93/715,735.58
  6. Step 6: Final answer
    x = 542,958.49

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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.