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Finding the Fourth Proportional to 751.28, 1,124.09 and 443.30

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Solution

The fourth proportional to 751.28, 1,124.09 and 443.30 is: 663.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.28 : 1,124.09 = 443.30 : x
  2. Step 2: Convert to fraction form
    751.28/1,124.09 = 443.30/x
  3. Step 3: Cross multiply
    751.28x = 1,124.09 × 443.30
  4. Step 4: Simplify right side
    751.28x = 498,306.88
  5. Step 5: Solve for x
    x = 498,306.88/751.28
  6. Step 6: Final answer
    x = 663.28

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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.