Home / 715,777.38-987,791.69-389,112.37

Finding the Fourth Proportional to 715,777.38, 987,791.69 and 389,112.37

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Solution

The fourth proportional to 715,777.38, 987,791.69 and 389,112.37 is: 536,985.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,777.38 : 987,791.69 = 389,112.37 : x
  2. Step 2: Convert to fraction form
    715,777.38/987,791.69 = 389,112.37/x
  3. Step 3: Cross multiply
    715,777.38x = 987,791.69 × 389,112.37
  4. Step 4: Simplify right side
    715,777.38x = 384,361,964,065.51
  5. Step 5: Solve for x
    x = 384,361,964,065.51/715,777.38
  6. Step 6: Final answer
    x = 536,985.35

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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.