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Finding the Fourth Proportional to 752.58, 1,129.41 and 428.58

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Solution

The fourth proportional to 752.58, 1,129.41 and 428.58 is: 643.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.58 : 1,129.41 = 428.58 : x
  2. Step 2: Convert to fraction form
    752.58/1,129.41 = 428.58/x
  3. Step 3: Cross multiply
    752.58x = 1,129.41 × 428.58
  4. Step 4: Simplify right side
    752.58x = 484,042.54
  5. Step 5: Solve for x
    x = 484,042.54/752.58
  6. Step 6: Final answer
    x = 643.18

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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.