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Finding the Fourth Proportional to 424.60, 636.90 and 404.80

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Solution

The fourth proportional to 424.60, 636.90 and 404.80 is: 607.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.60 : 636.90 = 404.80 : x
  2. Step 2: Convert to fraction form
    424.60/636.90 = 404.80/x
  3. Step 3: Cross multiply
    424.60x = 636.90 × 404.80
  4. Step 4: Simplify right side
    424.60x = 257,817.12
  5. Step 5: Solve for x
    x = 257,817.12/424.60
  6. Step 6: Final answer
    x = 607.20

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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.