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Finding the Fourth Proportional to 396,658.45, 546,630.31 and 389,370.28

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Solution

The fourth proportional to 396,658.45, 546,630.31 and 389,370.28 is: 536,586.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,658.45 : 546,630.31 = 389,370.28 : x
  2. Step 2: Convert to fraction form
    396,658.45/546,630.31 = 389,370.28/x
  3. Step 3: Cross multiply
    396,658.45x = 546,630.31 × 389,370.28
  4. Step 4: Simplify right side
    396,658.45x = 212,841,596,861.19
  5. Step 5: Solve for x
    x = 212,841,596,861.19/396,658.45
  6. Step 6: Final answer
    x = 536,586.57

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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.