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Finding the Fourth Proportional to 621.94, 931.56 and 404.86

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Solution

The fourth proportional to 621.94, 931.56 and 404.86 is: 606.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.94 : 931.56 = 404.86 : x
  2. Step 2: Convert to fraction form
    621.94/931.56 = 404.86/x
  3. Step 3: Cross multiply
    621.94x = 931.56 × 404.86
  4. Step 4: Simplify right side
    621.94x = 377,151.38
  5. Step 5: Solve for x
    x = 377,151.38/621.94
  6. Step 6: Final answer
    x = 606.41

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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.