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Finding the Fourth Proportional to 423,419.73, 634,995.78 and 139,063.43

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Solution

The fourth proportional to 423,419.73, 634,995.78 and 139,063.43 is: 208,551.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,419.73 : 634,995.78 = 139,063.43 : x
  2. Step 2: Convert to fraction form
    423,419.73/634,995.78 = 139,063.43/x
  3. Step 3: Cross multiply
    423,419.73x = 634,995.78 × 139,063.43
  4. Step 4: Simplify right side
    423,419.73x = 88,304,691,202.33
  5. Step 5: Solve for x
    x = 88,304,691,202.33/423,419.73
  6. Step 6: Final answer
    x = 208,551.20

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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.