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Finding the Fourth Proportional to 639,765,101.70, 958,212,761.85 and 639,765,101.70

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Solution

The fourth proportional to 639,765,101.70, 958,212,761.85 and 639,765,101.70 is: 958,212,761.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,765,101.70 : 958,212,761.85 = 639,765,101.70 : x
  2. Step 2: Convert to fraction form
    639,765,101.70/958,212,761.85 = 639,765,101.70/x
  3. Step 3: Cross multiply
    639,765,101.70x = 958,212,761.85 × 639,765,101.70
  4. Step 4: Simplify right side
    639,765,101.70x = 613,031,085,035,203,200
  5. Step 5: Solve for x
    x = 613,031,085,035,203,200/639,765,101.70
  6. Step 6: Final answer
    x = 958,212,761.85

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Double scale
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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.