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Finding the Fourth Proportional to 621.99, 930.85 and 438.52

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Solution

The fourth proportional to 621.99, 930.85 and 438.52 is: 656.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.99 : 930.85 = 438.52 : x
  2. Step 2: Convert to fraction form
    621.99/930.85 = 438.52/x
  3. Step 3: Cross multiply
    621.99x = 930.85 × 438.52
  4. Step 4: Simplify right side
    621.99x = 408,196.34
  5. Step 5: Solve for x
    x = 408,196.34/621.99
  6. Step 6: Final answer
    x = 656.27

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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.