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Finding the Fourth Proportional to 108.58, 162.57 and 67.90

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Solution

The fourth proportional to 108.58, 162.57 and 67.90 is: 101.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.58 : 162.57 = 67.90 : x
  2. Step 2: Convert to fraction form
    108.58/162.57 = 67.90/x
  3. Step 3: Cross multiply
    108.58x = 162.57 × 67.90
  4. Step 4: Simplify right side
    108.58x = 11,038.50
  5. Step 5: Solve for x
    x = 11,038.50/108.58
  6. Step 6: Final answer
    x = 101.66

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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.