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Finding the Fourth Proportional to 139,071,794.70, 208,607,692.05 and 81,591,602.70

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Solution

The fourth proportional to 139,071,794.70, 208,607,692.05 and 81,591,602.70 is: 122,387,404.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,071,794.70 : 208,607,692.05 = 81,591,602.70 : x
  2. Step 2: Convert to fraction form
    139,071,794.70/208,607,692.05 = 81,591,602.70/x
  3. Step 3: Cross multiply
    139,071,794.70x = 208,607,692.05 × 81,591,602.70
  4. Step 4: Simplify right side
    139,071,794.70x = 17,020,635,929,907,550
  5. Step 5: Solve for x
    x = 17,020,635,929,907,550/139,071,794.70
  6. Step 6: Final answer
    x = 122,387,404.05

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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.