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Finding the Fourth Proportional to 426.16, 639.43 and 253.17

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Solution

The fourth proportional to 426.16, 639.43 and 253.17 is: 379.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.16 : 639.43 = 253.17 : x
  2. Step 2: Convert to fraction form
    426.16/639.43 = 253.17/x
  3. Step 3: Cross multiply
    426.16x = 639.43 × 253.17
  4. Step 4: Simplify right side
    426.16x = 161,884.49
  5. Step 5: Solve for x
    x = 161,884.49/426.16
  6. Step 6: Final answer
    x = 379.87

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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.