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Finding the Fourth Proportional to 429.82, 644.58 and 210.28

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Solution

The fourth proportional to 429.82, 644.58 and 210.28 is: 315.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.82 : 644.58 = 210.28 : x
  2. Step 2: Convert to fraction form
    429.82/644.58 = 210.28/x
  3. Step 3: Cross multiply
    429.82x = 644.58 × 210.28
  4. Step 4: Simplify right side
    429.82x = 135,542.28
  5. Step 5: Solve for x
    x = 135,542.28/429.82
  6. Step 6: Final answer
    x = 315.35

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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.