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Finding the Fourth Proportional to 419,266.56, 628,998.12 and 138,783.72

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Solution

The fourth proportional to 419,266.56, 628,998.12 and 138,783.72 is: 208,208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,266.56 : 628,998.12 = 138,783.72 : x
  2. Step 2: Convert to fraction form
    419,266.56/628,998.12 = 138,783.72/x
  3. Step 3: Cross multiply
    419,266.56x = 628,998.12 × 138,783.72
  4. Step 4: Simplify right side
    419,266.56x = 87,294,698,966.61
  5. Step 5: Solve for x
    x = 87,294,698,966.61/419,266.56
  6. Step 6: Final answer
    x = 208,208.11

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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.