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Finding the Fourth Proportional to 715,939, 987,970.53 and 393,646.84

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Solution

The fourth proportional to 715,939, 987,970.53 and 393,646.84 is: 543,218.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,939 : 987,970.53 = 393,646.84 : x
  2. Step 2: Convert to fraction form
    715,939/987,970.53 = 393,646.84/x
  3. Step 3: Cross multiply
    715,939x = 987,970.53 × 393,646.84
  4. Step 4: Simplify right side
    715,939x = 388,911,477,147.63
  5. Step 5: Solve for x
    x = 388,911,477,147.63/715,939
  6. Step 6: Final answer
    x = 543,218.73

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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.