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Finding the Fourth Proportional to 396,655.95, 546,626.86 and 389,367.78

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Solution

The fourth proportional to 396,655.95, 546,626.86 and 389,367.78 is: 536,583.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,655.95 : 546,626.86 = 389,367.78 : x
  2. Step 2: Convert to fraction form
    396,655.95/546,626.86 = 389,367.78/x
  3. Step 3: Cross multiply
    396,655.95x = 546,626.86 × 389,367.78
  4. Step 4: Simplify right side
    396,655.95x = 212,838,886,966.57
  5. Step 5: Solve for x
    x = 212,838,886,966.57/396,655.95
  6. Step 6: Final answer
    x = 536,583.12

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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.