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Finding the Fourth Proportional to 744.31, 1,028.51 and 720.28

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Solution

The fourth proportional to 744.31, 1,028.51 and 720.28 is: 995.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.31 : 1,028.51 = 720.28 : x
  2. Step 2: Convert to fraction form
    744.31/1,028.51 = 720.28/x
  3. Step 3: Cross multiply
    744.31x = 1,028.51 × 720.28
  4. Step 4: Simplify right side
    744.31x = 740,815.18
  5. Step 5: Solve for x
    x = 740,815.18/744.31
  6. Step 6: Final answer
    x = 995.30

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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.