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Finding the Fourth Proportional to 128.93, 178.07 and 110.43

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Solution

The fourth proportional to 128.93, 178.07 and 110.43 is: 152.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.93 : 178.07 = 110.43 : x
  2. Step 2: Convert to fraction form
    128.93/178.07 = 110.43/x
  3. Step 3: Cross multiply
    128.93x = 178.07 × 110.43
  4. Step 4: Simplify right side
    128.93x = 19,663.72
  5. Step 5: Solve for x
    x = 19,663.72/128.93
  6. Step 6: Final answer
    x = 152.52

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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.