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Finding the Fourth Proportional to 415.36, 623.04 and 287.20

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Solution

The fourth proportional to 415.36, 623.04 and 287.20 is: 430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.36 : 623.04 = 287.20 : x
  2. Step 2: Convert to fraction form
    415.36/623.04 = 287.20/x
  3. Step 3: Cross multiply
    415.36x = 623.04 × 287.20
  4. Step 4: Simplify right side
    415.36x = 178,937.09
  5. Step 5: Solve for x
    x = 178,937.09/415.36
  6. Step 6: Final answer
    x = 430.80

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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.