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Finding the Fourth Proportional to 638,443,387.80, 957,665,081.70 and 638,443,387.80

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Solution

The fourth proportional to 638,443,387.80, 957,665,081.70 and 638,443,387.80 is: 957,665,081.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,443,387.80 : 957,665,081.70 = 638,443,387.80 : x
  2. Step 2: Convert to fraction form
    638,443,387.80/957,665,081.70 = 638,443,387.80/x
  3. Step 3: Cross multiply
    638,443,387.80x = 957,665,081.70 × 638,443,387.80
  4. Step 4: Simplify right side
    638,443,387.80x = 611,414,939,138,311,808
  5. Step 5: Solve for x
    x = 611,414,939,138,311,808/638,443,387.80
  6. Step 6: Final answer
    x = 957,665,081.70

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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.