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Finding the Fourth Proportional to 431.07, 642.81 and 427.17

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Solution

The fourth proportional to 431.07, 642.81 and 427.17 is: 636.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.07 : 642.81 = 427.17 : x
  2. Step 2: Convert to fraction form
    431.07/642.81 = 427.17/x
  3. Step 3: Cross multiply
    431.07x = 642.81 × 427.17
  4. Step 4: Simplify right side
    431.07x = 274,589.15
  5. Step 5: Solve for x
    x = 274,589.15/431.07
  6. Step 6: Final answer
    x = 636.99

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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.