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Finding the Fourth Proportional to 431.27, 647 and 142.70

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Solution

The fourth proportional to 431.27, 647 and 142.70 is: 214.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.27 : 647 = 142.70 : x
  2. Step 2: Convert to fraction form
    431.27/647 = 142.70/x
  3. Step 3: Cross multiply
    431.27x = 647 × 142.70
  4. Step 4: Simplify right side
    431.27x = 92,328.52
  5. Step 5: Solve for x
    x = 92,328.52/431.27
  6. Step 6: Final answer
    x = 214.09

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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.