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Finding the Fourth Proportional to 680,674,348.72, 939,378,705.70 and 379,279,667.55

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Solution

The fourth proportional to 680,674,348.72, 939,378,705.70 and 379,279,667.55 is: 523,432,745.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,674,348.72 : 939,378,705.70 = 379,279,667.55 : x
  2. Step 2: Convert to fraction form
    680,674,348.72/939,378,705.70 = 379,279,667.55/x
  3. Step 3: Cross multiply
    680,674,348.72x = 939,378,705.70 × 379,279,667.55
  4. Step 4: Simplify right side
    680,674,348.72x = 356,287,243,201,445,312
  5. Step 5: Solve for x
    x = 356,287,243,201,445,312/680,674,348.72
  6. Step 6: Final answer
    x = 523,432,745.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.