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Finding the Fourth Proportional to 108.51, 149.66 and 99.80

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Solution

The fourth proportional to 108.51, 149.66 and 99.80 is: 137.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.51 : 149.66 = 99.80 : x
  2. Step 2: Convert to fraction form
    108.51/149.66 = 99.80/x
  3. Step 3: Cross multiply
    108.51x = 149.66 × 99.80
  4. Step 4: Simplify right side
    108.51x = 14,934.82
  5. Step 5: Solve for x
    x = 14,934.82/108.51
  6. Step 6: Final answer
    x = 137.64

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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.