Home / 1,280.10-1,766.49-720.59

Finding the Fourth Proportional to 1,280.10, 1,766.49 and 720.59

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Solution

The fourth proportional to 1,280.10, 1,766.49 and 720.59 is: 994.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.10 : 1,766.49 = 720.59 : x
  2. Step 2: Convert to fraction form
    1,280.10/1,766.49 = 720.59/x
  3. Step 3: Cross multiply
    1,280.10x = 1,766.49 × 720.59
  4. Step 4: Simplify right side
    1,280.10x = 1,272,915.03
  5. Step 5: Solve for x
    x = 1,272,915.03/1,280.10
  6. Step 6: Final answer
    x = 994.39

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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.