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Finding the Fourth Proportional to 429.07, 639.83 and 425.17

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Solution

The fourth proportional to 429.07, 639.83 and 425.17 is: 634.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.07 : 639.83 = 425.17 : x
  2. Step 2: Convert to fraction form
    429.07/639.83 = 425.17/x
  3. Step 3: Cross multiply
    429.07x = 639.83 × 425.17
  4. Step 4: Simplify right side
    429.07x = 272,034.92
  5. Step 5: Solve for x
    x = 272,034.92/429.07
  6. Step 6: Final answer
    x = 634.02

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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.