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Finding the Fourth Proportional to 638,578,865.80, 957,868,298.70 and 485,523,857.80

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Solution

The fourth proportional to 638,578,865.80, 957,868,298.70 and 485,523,857.80 is: 728,285,786.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,578,865.80 : 957,868,298.70 = 485,523,857.80 : x
  2. Step 2: Convert to fraction form
    638,578,865.80/957,868,298.70 = 485,523,857.80/x
  3. Step 3: Cross multiply
    638,578,865.80x = 957,868,298.70 × 485,523,857.80
  4. Step 4: Simplify right side
    638,578,865.80x = 465,067,911,649,146,752
  5. Step 5: Solve for x
    x = 465,067,911,649,146,752/638,578,865.80
  6. Step 6: Final answer
    x = 728,285,786.70

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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.