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Finding the Fourth Proportional to 752.11, 1,128.23 and 258.86

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Solution

The fourth proportional to 752.11, 1,128.23 and 258.86 is: 388.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.11 : 1,128.23 = 258.86 : x
  2. Step 2: Convert to fraction form
    752.11/1,128.23 = 258.86/x
  3. Step 3: Cross multiply
    752.11x = 1,128.23 × 258.86
  4. Step 4: Simplify right side
    752.11x = 292,053.62
  5. Step 5: Solve for x
    x = 292,053.62/752.11
  6. Step 6: Final answer
    x = 388.31

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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.