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Finding the Fourth Proportional to 752.30, 1,128.72 and 258.75

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Solution

The fourth proportional to 752.30, 1,128.72 and 258.75 is: 388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.30 : 1,128.72 = 258.75 : x
  2. Step 2: Convert to fraction form
    752.30/1,128.72 = 258.75/x
  3. Step 3: Cross multiply
    752.30x = 1,128.72 × 258.75
  4. Step 4: Simplify right side
    752.30x = 292,055.65
  5. Step 5: Solve for x
    x = 292,055.65/752.30
  6. Step 6: Final answer
    x = 388.22

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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.