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Finding the Fourth Proportional to 425.04, 636.66 and 420.18

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Solution

The fourth proportional to 425.04, 636.66 and 420.18 is: 629.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.04 : 636.66 = 420.18 : x
  2. Step 2: Convert to fraction form
    425.04/636.66 = 420.18/x
  3. Step 3: Cross multiply
    425.04x = 636.66 × 420.18
  4. Step 4: Simplify right side
    425.04x = 267,511.80
  5. Step 5: Solve for x
    x = 267,511.80/425.04
  6. Step 6: Final answer
    x = 629.38

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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.