Home / 1,274.04-1,911.20-408.36

Finding the Fourth Proportional to 1,274.04, 1,911.20 and 408.36

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Solution

The fourth proportional to 1,274.04, 1,911.20 and 408.36 is: 612.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.04 : 1,911.20 = 408.36 : x
  2. Step 2: Convert to fraction form
    1,274.04/1,911.20 = 408.36/x
  3. Step 3: Cross multiply
    1,274.04x = 1,911.20 × 408.36
  4. Step 4: Simplify right side
    1,274.04x = 780,457.63
  5. Step 5: Solve for x
    x = 780,457.63/1,274.04
  6. Step 6: Final answer
    x = 612.58

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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.