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Finding the Fourth Proportional to 640,978,082.70, 961,467,124.05 and 634,175,637.90

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Solution

The fourth proportional to 640,978,082.70, 961,467,124.05 and 634,175,637.90 is: 951,263,456.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,978,082.70 : 961,467,124.05 = 634,175,637.90 : x
  2. Step 2: Convert to fraction form
    640,978,082.70/961,467,124.05 = 634,175,637.90/x
  3. Step 3: Cross multiply
    640,978,082.70x = 961,467,124.05 × 634,175,637.90
  4. Step 4: Simplify right side
    640,978,082.70x = 609,739,026,714,287,104
  5. Step 5: Solve for x
    x = 609,739,026,714,287,104/640,978,082.70
  6. Step 6: Final answer
    x = 951,263,456.85

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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.