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Finding the Fourth Proportional to 128, 176.64 and 108.25

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Solution

The fourth proportional to 128, 176.64 and 108.25 is: 149.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 176.64 = 108.25 : x
  2. Step 2: Convert to fraction form
    128/176.64 = 108.25/x
  3. Step 3: Cross multiply
    128x = 176.64 × 108.25
  4. Step 4: Simplify right side
    128x = 19,121.28
  5. Step 5: Solve for x
    x = 19,121.28/128
  6. Step 6: Final answer
    x = 149.39

Related Problems

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Similar ratio
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1.5x scale

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.