Home / 1,272.20-1,908.09-492.55

Finding the Fourth Proportional to 1,272.20, 1,908.09 and 492.55

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Solution

The fourth proportional to 1,272.20, 1,908.09 and 492.55 is: 738.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.20 : 1,908.09 = 492.55 : x
  2. Step 2: Convert to fraction form
    1,272.20/1,908.09 = 492.55/x
  3. Step 3: Cross multiply
    1,272.20x = 1,908.09 × 492.55
  4. Step 4: Simplify right side
    1,272.20x = 939,824.96
  5. Step 5: Solve for x
    x = 939,824.96/1,272.20
  6. Step 6: Final answer
    x = 738.74

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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.