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Finding the Fourth Proportional to 752.70, 1,128.93 and 290.31

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Solution

The fourth proportional to 752.70, 1,128.93 and 290.31 is: 435.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.70 : 1,128.93 = 290.31 : x
  2. Step 2: Convert to fraction form
    752.70/1,128.93 = 290.31/x
  3. Step 3: Cross multiply
    752.70x = 1,128.93 × 290.31
  4. Step 4: Simplify right side
    752.70x = 327,739.67
  5. Step 5: Solve for x
    x = 327,739.67/752.70
  6. Step 6: Final answer
    x = 435.42

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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.