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Finding the Fourth Proportional to 425.93, 635.54 and 421.79

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Solution

The fourth proportional to 425.93, 635.54 and 421.79 is: 629.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.93 : 635.54 = 421.79 : x
  2. Step 2: Convert to fraction form
    425.93/635.54 = 421.79/x
  3. Step 3: Cross multiply
    425.93x = 635.54 × 421.79
  4. Step 4: Simplify right side
    425.93x = 268,059.13
  5. Step 5: Solve for x
    x = 268,059.13/425.93
  6. Step 6: Final answer
    x = 629.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.