Home / 1,230.50-1,845.75-318.50

Finding the Fourth Proportional to 1,230.50, 1,845.75 and 318.50

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Solution

The fourth proportional to 1,230.50, 1,845.75 and 318.50 is: 477.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.50 : 1,845.75 = 318.50 : x
  2. Step 2: Convert to fraction form
    1,230.50/1,845.75 = 318.50/x
  3. Step 3: Cross multiply
    1,230.50x = 1,845.75 × 318.50
  4. Step 4: Simplify right side
    1,230.50x = 587,871.38
  5. Step 5: Solve for x
    x = 587,871.38/1,230.50
  6. Step 6: Final answer
    x = 477.75

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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.