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Finding the Fourth Proportional to 128.66, 177.53 and 102.47

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Solution

The fourth proportional to 128.66, 177.53 and 102.47 is: 141.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.66 : 177.53 = 102.47 : x
  2. Step 2: Convert to fraction form
    128.66/177.53 = 102.47/x
  3. Step 3: Cross multiply
    128.66x = 177.53 × 102.47
  4. Step 4: Simplify right side
    128.66x = 18,190.10
  5. Step 5: Solve for x
    x = 18,190.10/128.66
  6. Step 6: Final answer
    x = 141.39

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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.