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Finding the Fourth Proportional to 419,178.54, 628,767.81 and 103,638.18

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Solution

The fourth proportional to 419,178.54, 628,767.81 and 103,638.18 is: 155,457.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,178.54 : 628,767.81 = 103,638.18 : x
  2. Step 2: Convert to fraction form
    419,178.54/628,767.81 = 103,638.18/x
  3. Step 3: Cross multiply
    419,178.54x = 628,767.81 × 103,638.18
  4. Step 4: Simplify right side
    419,178.54x = 65,164,351,470.99
  5. Step 5: Solve for x
    x = 65,164,351,470.99/419,178.54
  6. Step 6: Final answer
    x = 155,457.27

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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.