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Finding the Fourth Proportional to 396,507.69, 546,426.41 and 389,220.93

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Solution

The fourth proportional to 396,507.69, 546,426.41 and 389,220.93 is: 536,384.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,507.69 : 546,426.41 = 389,220.93 : x
  2. Step 2: Convert to fraction form
    396,507.69/546,426.41 = 389,220.93/x
  3. Step 3: Cross multiply
    396,507.69x = 546,426.41 × 389,220.93
  4. Step 4: Simplify right side
    396,507.69x = 212,680,593,530.66
  5. Step 5: Solve for x
    x = 212,680,593,530.66/396,507.69
  6. Step 6: Final answer
    x = 536,384.54

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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.