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Finding the Fourth Proportional to 621.42, 930.83 and 415.32

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Solution

The fourth proportional to 621.42, 930.83 and 415.32 is: 622.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.42 : 930.83 = 415.32 : x
  2. Step 2: Convert to fraction form
    621.42/930.83 = 415.32/x
  3. Step 3: Cross multiply
    621.42x = 930.83 × 415.32
  4. Step 4: Simplify right side
    621.42x = 386,590.24
  5. Step 5: Solve for x
    x = 386,590.24/621.42
  6. Step 6: Final answer
    x = 622.11

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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.