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Finding the Fourth Proportional to 752.45, 1,128.45 and 290.20

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Solution

The fourth proportional to 752.45, 1,128.45 and 290.20 is: 435.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.45 : 1,128.45 = 290.20 : x
  2. Step 2: Convert to fraction form
    752.45/1,128.45 = 290.20/x
  3. Step 3: Cross multiply
    752.45x = 1,128.45 × 290.20
  4. Step 4: Simplify right side
    752.45x = 327,470.55
  5. Step 5: Solve for x
    x = 327,470.55/752.45
  6. Step 6: Final answer
    x = 435.21

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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.