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Finding the Fourth Proportional to 431.40, 647.36 and 226.10

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Solution

The fourth proportional to 431.40, 647.36 and 226.10 is: 339.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.40 : 647.36 = 226.10 : x
  2. Step 2: Convert to fraction form
    431.40/647.36 = 226.10/x
  3. Step 3: Cross multiply
    431.40x = 647.36 × 226.10
  4. Step 4: Simplify right side
    431.40x = 146,369.43
  5. Step 5: Solve for x
    x = 146,369.43/431.40
  6. Step 6: Final answer
    x = 339.29

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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.