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Finding the Fourth Proportional to 418,959.73, 628,431.09 and 103,419.37

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Solution

The fourth proportional to 418,959.73, 628,431.09 and 103,419.37 is: 155,126.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,959.73 : 628,431.09 = 103,419.37 : x
  2. Step 2: Convert to fraction form
    418,959.73/628,431.09 = 103,419.37/x
  3. Step 3: Cross multiply
    418,959.73x = 628,431.09 × 103,419.37
  4. Step 4: Simplify right side
    418,959.73x = 64,991,947,416.21
  5. Step 5: Solve for x
    x = 64,991,947,416.21/418,959.73
  6. Step 6: Final answer
    x = 155,126.96

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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.