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Finding the Fourth Proportional to 744.90, 1,028.40 and 558.33

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Solution

The fourth proportional to 744.90, 1,028.40 and 558.33 is: 770.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.90 : 1,028.40 = 558.33 : x
  2. Step 2: Convert to fraction form
    744.90/1,028.40 = 558.33/x
  3. Step 3: Cross multiply
    744.90x = 1,028.40 × 558.33
  4. Step 4: Simplify right side
    744.90x = 574,186.57
  5. Step 5: Solve for x
    x = 574,186.57/744.90
  6. Step 6: Final answer
    x = 770.82

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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.