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Finding the Fourth Proportional to 755.53, 1,138.44 and 621.58

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Solution

The fourth proportional to 755.53, 1,138.44 and 621.58 is: 936.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.53 : 1,138.44 = 621.58 : x
  2. Step 2: Convert to fraction form
    755.53/1,138.44 = 621.58/x
  3. Step 3: Cross multiply
    755.53x = 1,138.44 × 621.58
  4. Step 4: Simplify right side
    755.53x = 707,631.54
  5. Step 5: Solve for x
    x = 707,631.54/755.53
  6. Step 6: Final answer
    x = 936.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.