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Finding the Fourth Proportional to 415.40, 623.84 and 394.13

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Solution

The fourth proportional to 415.40, 623.84 and 394.13 is: 591.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.40 : 623.84 = 394.13 : x
  2. Step 2: Convert to fraction form
    415.40/623.84 = 394.13/x
  3. Step 3: Cross multiply
    415.40x = 623.84 × 394.13
  4. Step 4: Simplify right side
    415.40x = 245,873.65
  5. Step 5: Solve for x
    x = 245,873.65/415.40
  6. Step 6: Final answer
    x = 591.90

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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.