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Finding the Fourth Proportional to 1,083.78, 1,625.33 and 720.50

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Solution

The fourth proportional to 1,083.78, 1,625.33 and 720.50 is: 1,080.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.78 : 1,625.33 = 720.50 : x
  2. Step 2: Convert to fraction form
    1,083.78/1,625.33 = 720.50/x
  3. Step 3: Cross multiply
    1,083.78x = 1,625.33 × 720.50
  4. Step 4: Simplify right side
    1,083.78x = 1,171,043.94
  5. Step 5: Solve for x
    x = 1,171,043.94/1,083.78
  6. Step 6: Final answer
    x = 1,080.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.