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Finding the Fourth Proportional to 395,539.79, 545,805.81 and 221,077.33

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Solution

The fourth proportional to 395,539.79, 545,805.81 and 221,077.33 is: 305,064.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,539.79 : 545,805.81 = 221,077.33 : x
  2. Step 2: Convert to fraction form
    395,539.79/545,805.81 = 221,077.33/x
  3. Step 3: Cross multiply
    395,539.79x = 545,805.81 × 221,077.33
  4. Step 4: Simplify right side
    395,539.79x = 120,665,292,878.93
  5. Step 5: Solve for x
    x = 120,665,292,878.93/395,539.79
  6. Step 6: Final answer
    x = 305,064.87

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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.