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Finding the Fourth Proportional to 396,620,020.80, 555,841,985.40 and 396,620,020.80

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Solution

The fourth proportional to 396,620,020.80, 555,841,985.40 and 396,620,020.80 is: 555,841,985.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,620,020.80 : 555,841,985.40 = 396,620,020.80 : x
  2. Step 2: Convert to fraction form
    396,620,020.80/555,841,985.40 = 396,620,020.80/x
  3. Step 3: Cross multiply
    396,620,020.80x = 555,841,985.40 × 396,620,020.80
  4. Step 4: Simplify right side
    396,620,020.80x = 220,458,059,810,861,280
  5. Step 5: Solve for x
    x = 220,458,059,810,861,280/396,620,020.80
  6. Step 6: Final answer
    x = 555,841,985.40

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.