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Finding the Fourth Proportional to 420.12, 630.17 and 111.97

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Solution

The fourth proportional to 420.12, 630.17 and 111.97 is: 167.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.12 : 630.17 = 111.97 : x
  2. Step 2: Convert to fraction form
    420.12/630.17 = 111.97/x
  3. Step 3: Cross multiply
    420.12x = 630.17 × 111.97
  4. Step 4: Simplify right side
    420.12x = 70,560.13
  5. Step 5: Solve for x
    x = 70,560.13/420.12
  6. Step 6: Final answer
    x = 167.95

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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.