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Finding the Fourth Proportional to 391,424,276.40, 587,589,755.40 and 210,025,748.40

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Solution

The fourth proportional to 391,424,276.40, 587,589,755.40 and 210,025,748.40 is: 315,281,870.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,424,276.40 : 587,589,755.40 = 210,025,748.40 : x
  2. Step 2: Convert to fraction form
    391,424,276.40/587,589,755.40 = 210,025,748.40/x
  3. Step 3: Cross multiply
    391,424,276.40x = 587,589,755.40 × 210,025,748.40
  4. Step 4: Simplify right side
    391,424,276.40x = 123,408,978,130,057,936
  5. Step 5: Solve for x
    x = 123,408,978,130,057,936/391,424,276.40
  6. Step 6: Final answer
    x = 315,281,870.77

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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.