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Finding the Fourth Proportional to 128.48, 191.44 and 127.24

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Solution

The fourth proportional to 128.48, 191.44 and 127.24 is: 189.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 191.44 = 127.24 : x
  2. Step 2: Convert to fraction form
    128.48/191.44 = 127.24/x
  3. Step 3: Cross multiply
    128.48x = 191.44 × 127.24
  4. Step 4: Simplify right side
    128.48x = 24,358.83
  5. Step 5: Solve for x
    x = 24,358.83/128.48
  6. Step 6: Final answer
    x = 189.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.