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Finding the Fourth Proportional to 420.92, 631.40 and 201.49

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Solution

The fourth proportional to 420.92, 631.40 and 201.49 is: 302.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.92 : 631.40 = 201.49 : x
  2. Step 2: Convert to fraction form
    420.92/631.40 = 201.49/x
  3. Step 3: Cross multiply
    420.92x = 631.40 × 201.49
  4. Step 4: Simplify right side
    420.92x = 127,218.20
  5. Step 5: Solve for x
    x = 127,218.20/420.92
  6. Step 6: Final answer
    x = 302.24

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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.