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Finding the Fourth Proportional to 425.96, 638.40 and 360.72

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Solution

The fourth proportional to 425.96, 638.40 and 360.72 is: 540.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.96 : 638.40 = 360.72 : x
  2. Step 2: Convert to fraction form
    425.96/638.40 = 360.72/x
  3. Step 3: Cross multiply
    425.96x = 638.40 × 360.72
  4. Step 4: Simplify right side
    425.96x = 230,283.65
  5. Step 5: Solve for x
    x = 230,283.65/425.96
  6. Step 6: Final answer
    x = 540.62

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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.