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Finding the Fourth Proportional to 751.12, 1,126.80 and 443.20

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Solution

The fourth proportional to 751.12, 1,126.80 and 443.20 is: 664.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.12 : 1,126.80 = 443.20 : x
  2. Step 2: Convert to fraction form
    751.12/1,126.80 = 443.20/x
  3. Step 3: Cross multiply
    751.12x = 1,126.80 × 443.20
  4. Step 4: Simplify right side
    751.12x = 499,397.76
  5. Step 5: Solve for x
    x = 499,397.76/751.12
  6. Step 6: Final answer
    x = 664.87

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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.