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Finding the Fourth Proportional to 108.10, 162.10 and 47.20

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Solution

The fourth proportional to 108.10, 162.10 and 47.20 is: 70.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.10 : 162.10 = 47.20 : x
  2. Step 2: Convert to fraction form
    108.10/162.10 = 47.20/x
  3. Step 3: Cross multiply
    108.10x = 162.10 × 47.20
  4. Step 4: Simplify right side
    108.10x = 7,651.12
  5. Step 5: Solve for x
    x = 7,651.12/108.10
  6. Step 6: Final answer
    x = 70.78

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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.