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Finding the Fourth Proportional to 621.53, 931.19 and 426.23

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Solution

The fourth proportional to 621.53, 931.19 and 426.23 is: 638.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.53 : 931.19 = 426.23 : x
  2. Step 2: Convert to fraction form
    621.53/931.19 = 426.23/x
  3. Step 3: Cross multiply
    621.53x = 931.19 × 426.23
  4. Step 4: Simplify right side
    621.53x = 396,894.33
  5. Step 5: Solve for x
    x = 396,894.33/621.53
  6. Step 6: Final answer
    x = 638.58

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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.