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Finding the Fourth Proportional to 425.08, 636.18 and 320.68

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Solution

The fourth proportional to 425.08, 636.18 and 320.68 is: 479.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.08 : 636.18 = 320.68 : x
  2. Step 2: Convert to fraction form
    425.08/636.18 = 320.68/x
  3. Step 3: Cross multiply
    425.08x = 636.18 × 320.68
  4. Step 4: Simplify right side
    425.08x = 204,010.20
  5. Step 5: Solve for x
    x = 204,010.20/425.08
  6. Step 6: Final answer
    x = 479.93

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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.