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Finding the Fourth Proportional to 144.54, 215.64 and 128.34

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Solution

The fourth proportional to 144.54, 215.64 and 128.34 is: 191.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.54 : 215.64 = 128.34 : x
  2. Step 2: Convert to fraction form
    144.54/215.64 = 128.34/x
  3. Step 3: Cross multiply
    144.54x = 215.64 × 128.34
  4. Step 4: Simplify right side
    144.54x = 27,675.24
  5. Step 5: Solve for x
    x = 27,675.24/144.54
  6. Step 6: Final answer
    x = 191.47

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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.