Home / 1,280.13-1,766.36-720.56

Finding the Fourth Proportional to 1,280.13, 1,766.36 and 720.56

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Solution

The fourth proportional to 1,280.13, 1,766.36 and 720.56 is: 994.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.13 : 1,766.36 = 720.56 : x
  2. Step 2: Convert to fraction form
    1,280.13/1,766.36 = 720.56/x
  3. Step 3: Cross multiply
    1,280.13x = 1,766.36 × 720.56
  4. Step 4: Simplify right side
    1,280.13x = 1,272,755.93
  5. Step 5: Solve for x
    x = 1,272,755.93/1,280.13
  6. Step 6: Final answer
    x = 994.24

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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.