Home / 1,209.28-1,812.48-439.36

Finding the Fourth Proportional to 1,209.28, 1,812.48 and 439.36

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Solution

The fourth proportional to 1,209.28, 1,812.48 and 439.36 is: 658.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.28 : 1,812.48 = 439.36 : x
  2. Step 2: Convert to fraction form
    1,209.28/1,812.48 = 439.36/x
  3. Step 3: Cross multiply
    1,209.28x = 1,812.48 × 439.36
  4. Step 4: Simplify right side
    1,209.28x = 796,331.21
  5. Step 5: Solve for x
    x = 796,331.21/1,209.28
  6. Step 6: Final answer
    x = 658.52

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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.