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Finding the Fourth Proportional to 421.39, 631.72 and 201.89

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Solution

The fourth proportional to 421.39, 631.72 and 201.89 is: 302.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.39 : 631.72 = 201.89 : x
  2. Step 2: Convert to fraction form
    421.39/631.72 = 201.89/x
  3. Step 3: Cross multiply
    421.39x = 631.72 × 201.89
  4. Step 4: Simplify right side
    421.39x = 127,536.94
  5. Step 5: Solve for x
    x = 127,536.94/421.39
  6. Step 6: Final answer
    x = 302.66

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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.