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Finding the Fourth Proportional to 420, 630.10 and 131.44

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Solution

The fourth proportional to 420, 630.10 and 131.44 is: 197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    420 : 630.10 = 131.44 : x
  2. Step 2: Convert to fraction form
    420/630.10 = 131.44/x
  3. Step 3: Cross multiply
    420x = 630.10 × 131.44
  4. Step 4: Simplify right side
    420x = 82,820.34
  5. Step 5: Solve for x
    x = 82,820.34/420
  6. Step 6: Final answer
    x = 197.19

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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.