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Finding the Fourth Proportional to 640,978,516.70, 961,467,775.05 and 634,176,071.90

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Solution

The fourth proportional to 640,978,516.70, 961,467,775.05 and 634,176,071.90 is: 951,264,107.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,978,516.70 : 961,467,775.05 = 634,176,071.90 : x
  2. Step 2: Convert to fraction form
    640,978,516.70/961,467,775.05 = 634,176,071.90/x
  3. Step 3: Cross multiply
    640,978,516.70x = 961,467,775.05 × 634,176,071.90
  4. Step 4: Simplify right side
    640,978,516.70x = 609,739,856,839,641,728
  5. Step 5: Solve for x
    x = 609,739,856,839,641,728/640,978,516.70
  6. Step 6: Final answer
    x = 951,264,107.85

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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.