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Finding the Fourth Proportional to 1,245.13, 1,866.78 and 423.18

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Solution

The fourth proportional to 1,245.13, 1,866.78 and 423.18 is: 634.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.13 : 1,866.78 = 423.18 : x
  2. Step 2: Convert to fraction form
    1,245.13/1,866.78 = 423.18/x
  3. Step 3: Cross multiply
    1,245.13x = 1,866.78 × 423.18
  4. Step 4: Simplify right side
    1,245.13x = 789,983.96
  5. Step 5: Solve for x
    x = 789,983.96/1,245.13
  6. Step 6: Final answer
    x = 634.46

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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.