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Finding the Fourth Proportional to 108, 149.28 and 84.70

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Solution

The fourth proportional to 108, 149.28 and 84.70 is: 117.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    108 : 149.28 = 84.70 : x
  2. Step 2: Convert to fraction form
    108/149.28 = 84.70/x
  3. Step 3: Cross multiply
    108x = 149.28 × 84.70
  4. Step 4: Simplify right side
    108x = 12,644.02
  5. Step 5: Solve for x
    x = 12,644.02/108
  6. Step 6: Final answer
    x = 117.07

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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.