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Finding the Fourth Proportional to 744.16, 1,028.28 and 578.80

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Solution

The fourth proportional to 744.16, 1,028.28 and 578.80 is: 799.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.16 : 1,028.28 = 578.80 : x
  2. Step 2: Convert to fraction form
    744.16/1,028.28 = 578.80/x
  3. Step 3: Cross multiply
    744.16x = 1,028.28 × 578.80
  4. Step 4: Simplify right side
    744.16x = 595,168.46
  5. Step 5: Solve for x
    x = 595,168.46/744.16
  6. Step 6: Final answer
    x = 799.79

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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.