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Finding the Fourth Proportional to 752.22, 1,128.28 and 313.28

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Solution

The fourth proportional to 752.22, 1,128.28 and 313.28 is: 469.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.22 : 1,128.28 = 313.28 : x
  2. Step 2: Convert to fraction form
    752.22/1,128.28 = 313.28/x
  3. Step 3: Cross multiply
    752.22x = 1,128.28 × 313.28
  4. Step 4: Simplify right side
    752.22x = 353,467.56
  5. Step 5: Solve for x
    x = 353,467.56/752.22
  6. Step 6: Final answer
    x = 469.90

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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.