Home / 1,280.00-1,766.25-720.53

Finding the Fourth Proportional to 1,280.00, 1,766.25 and 720.53

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Solution

The fourth proportional to 1,280.00, 1,766.25 and 720.53 is: 994.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.00 : 1,766.25 = 720.53 : x
  2. Step 2: Convert to fraction form
    1,280.00/1,766.25 = 720.53/x
  3. Step 3: Cross multiply
    1,280.00x = 1,766.25 × 720.53
  4. Step 4: Simplify right side
    1,280.00x = 1,272,627.28
  5. Step 5: Solve for x
    x = 1,272,627.28/1,280.00
  6. Step 6: Final answer
    x = 994.24

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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.