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Finding the Fourth Proportional to 420.94, 631.56 and 204.46

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Solution

The fourth proportional to 420.94, 631.56 and 204.46 is: 306.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.94 : 631.56 = 204.46 : x
  2. Step 2: Convert to fraction form
    420.94/631.56 = 204.46/x
  3. Step 3: Cross multiply
    420.94x = 631.56 × 204.46
  4. Step 4: Simplify right side
    420.94x = 129,128.76
  5. Step 5: Solve for x
    x = 129,128.76/420.94
  6. Step 6: Final answer
    x = 306.76

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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.