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Finding the Fourth Proportional to 395,540.79, 545,807.19 and 221,078.33

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Solution

The fourth proportional to 395,540.79, 545,807.19 and 221,078.33 is: 305,066.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,540.79 : 545,807.19 = 221,078.33 : x
  2. Step 2: Convert to fraction form
    395,540.79/545,807.19 = 221,078.33/x
  3. Step 3: Cross multiply
    395,540.79x = 545,807.19 × 221,078.33
  4. Step 4: Simplify right side
    395,540.79x = 120,666,142,067.19
  5. Step 5: Solve for x
    x = 120,666,142,067.19/395,540.79
  6. Step 6: Final answer
    x = 305,066.24

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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.