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Finding the Fourth Proportional to 108.16, 162.36 and 91.18

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Solution

The fourth proportional to 108.16, 162.36 and 91.18 is: 136.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.16 : 162.36 = 91.18 : x
  2. Step 2: Convert to fraction form
    108.16/162.36 = 91.18/x
  3. Step 3: Cross multiply
    108.16x = 162.36 × 91.18
  4. Step 4: Simplify right side
    108.16x = 14,803.98
  5. Step 5: Solve for x
    x = 14,803.98/108.16
  6. Step 6: Final answer
    x = 136.87

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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.