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Finding the Fourth Proportional to 415.92, 623.88 and 390.36

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Solution

The fourth proportional to 415.92, 623.88 and 390.36 is: 585.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.92 : 623.88 = 390.36 : x
  2. Step 2: Convert to fraction form
    415.92/623.88 = 390.36/x
  3. Step 3: Cross multiply
    415.92x = 623.88 × 390.36
  4. Step 4: Simplify right side
    415.92x = 243,537.80
  5. Step 5: Solve for x
    x = 243,537.80/415.92
  6. Step 6: Final answer
    x = 585.54

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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.