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Finding the Fourth Proportional to 635.94, 953.90 and 420.48

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Solution

The fourth proportional to 635.94, 953.90 and 420.48 is: 630.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    635.94 : 953.90 = 420.48 : x
  2. Step 2: Convert to fraction form
    635.94/953.90 = 420.48/x
  3. Step 3: Cross multiply
    635.94x = 953.90 × 420.48
  4. Step 4: Simplify right side
    635.94x = 401,095.87
  5. Step 5: Solve for x
    x = 401,095.87/635.94
  6. Step 6: Final answer
    x = 630.71

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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.