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Finding the Fourth Proportional to 753.31, 1,128.33 and 621.83

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Solution

The fourth proportional to 753.31, 1,128.33 and 621.83 is: 931.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.31 : 1,128.33 = 621.83 : x
  2. Step 2: Convert to fraction form
    753.31/1,128.33 = 621.83/x
  3. Step 3: Cross multiply
    753.31x = 1,128.33 × 621.83
  4. Step 4: Simplify right side
    753.31x = 701,629.44
  5. Step 5: Solve for x
    x = 701,629.44/753.31
  6. Step 6: Final answer
    x = 931.40

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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.