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Finding the Fourth Proportional to 108.84, 149.85 and 86.67

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Solution

The fourth proportional to 108.84, 149.85 and 86.67 is: 119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.84 : 149.85 = 86.67 : x
  2. Step 2: Convert to fraction form
    108.84/149.85 = 86.67/x
  3. Step 3: Cross multiply
    108.84x = 149.85 × 86.67
  4. Step 4: Simplify right side
    108.84x = 12,987.50
  5. Step 5: Solve for x
    x = 12,987.50/108.84
  6. Step 6: Final answer
    x = 119.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.