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Finding the Fourth Proportional to 421.89, 633.05 and 319.14

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Solution

The fourth proportional to 421.89, 633.05 and 319.14 is: 478.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.89 : 633.05 = 319.14 : x
  2. Step 2: Convert to fraction form
    421.89/633.05 = 319.14/x
  3. Step 3: Cross multiply
    421.89x = 633.05 × 319.14
  4. Step 4: Simplify right side
    421.89x = 202,031.18
  5. Step 5: Solve for x
    x = 202,031.18/421.89
  6. Step 6: Final answer
    x = 478.88

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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.