Home / 1,280.35-1,766.53-720.79

Finding the Fourth Proportional to 1,280.35, 1,766.53 and 720.79

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Solution

The fourth proportional to 1,280.35, 1,766.53 and 720.79 is: 994.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.35 : 1,766.53 = 720.79 : x
  2. Step 2: Convert to fraction form
    1,280.35/1,766.53 = 720.79/x
  3. Step 3: Cross multiply
    1,280.35x = 1,766.53 × 720.79
  4. Step 4: Simplify right side
    1,280.35x = 1,273,293.64
  5. Step 5: Solve for x
    x = 1,273,293.64/1,280.35
  6. Step 6: Final answer
    x = 994.49

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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.