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Finding the Fourth Proportional to 428,412.70, 642,619.05 and 251,119.90

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Solution

The fourth proportional to 428,412.70, 642,619.05 and 251,119.90 is: 376,679.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,412.70 : 642,619.05 = 251,119.90 : x
  2. Step 2: Convert to fraction form
    428,412.70/642,619.05 = 251,119.90/x
  3. Step 3: Cross multiply
    428,412.70x = 642,619.05 × 251,119.90
  4. Step 4: Simplify right side
    428,412.70x = 161,374,431,574.10
  5. Step 5: Solve for x
    x = 161,374,431,574.10/428,412.70
  6. Step 6: Final answer
    x = 376,679.85

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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.