Home / 1,279.89-1,766.25-720.41

Finding the Fourth Proportional to 1,279.89, 1,766.25 and 720.41

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Solution

The fourth proportional to 1,279.89, 1,766.25 and 720.41 is: 994.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.89 : 1,766.25 = 720.41 : x
  2. Step 2: Convert to fraction form
    1,279.89/1,766.25 = 720.41/x
  3. Step 3: Cross multiply
    1,279.89x = 1,766.25 × 720.41
  4. Step 4: Simplify right side
    1,279.89x = 1,272,415.33
  5. Step 5: Solve for x
    x = 1,272,415.33/1,279.89
  6. Step 6: Final answer
    x = 994.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.