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Finding the Fourth Proportional to 628,992,019.80, 943,488,029.70 and 445,326,010.20

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Solution

The fourth proportional to 628,992,019.80, 943,488,029.70 and 445,326,010.20 is: 667,989,015.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,992,019.80 : 943,488,029.70 = 445,326,010.20 : x
  2. Step 2: Convert to fraction form
    628,992,019.80/943,488,029.70 = 445,326,010.20/x
  3. Step 3: Cross multiply
    628,992,019.80x = 943,488,029.70 × 445,326,010.20
  4. Step 4: Simplify right side
    628,992,019.80x = 420,159,759,937,760,128
  5. Step 5: Solve for x
    x = 420,159,759,937,760,128/628,992,019.80
  6. Step 6: Final answer
    x = 667,989,015.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.