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Finding the Fourth Proportional to 420.16, 630.20 and 131.52

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Solution

The fourth proportional to 420.16, 630.20 and 131.52 is: 197.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.16 : 630.20 = 131.52 : x
  2. Step 2: Convert to fraction form
    420.16/630.20 = 131.52/x
  3. Step 3: Cross multiply
    420.16x = 630.20 × 131.52
  4. Step 4: Simplify right side
    420.16x = 82,883.90
  5. Step 5: Solve for x
    x = 82,883.90/420.16
  6. Step 6: Final answer
    x = 197.27

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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.