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Finding the Fourth Proportional to 420, 630.16 and 163.52

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Solution

The fourth proportional to 420, 630.16 and 163.52 is: 245.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    420 : 630.16 = 163.52 : x
  2. Step 2: Convert to fraction form
    420/630.16 = 163.52/x
  3. Step 3: Cross multiply
    420x = 630.16 × 163.52
  4. Step 4: Simplify right side
    420x = 103,043.76
  5. Step 5: Solve for x
    x = 103,043.76/420
  6. Step 6: Final answer
    x = 245.34

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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.