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Finding the Fourth Proportional to 431.48, 647.40 and 200.23

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Solution

The fourth proportional to 431.48, 647.40 and 200.23 is: 300.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.48 : 647.40 = 200.23 : x
  2. Step 2: Convert to fraction form
    431.48/647.40 = 200.23/x
  3. Step 3: Cross multiply
    431.48x = 647.40 × 200.23
  4. Step 4: Simplify right side
    431.48x = 129,628.90
  5. Step 5: Solve for x
    x = 129,628.90/431.48
  6. Step 6: Final answer
    x = 300.43

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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.