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Finding the Fourth Proportional to 149.63, 206.24 and 128.79

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Solution

The fourth proportional to 149.63, 206.24 and 128.79 is: 177.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.63 : 206.24 = 128.79 : x
  2. Step 2: Convert to fraction form
    149.63/206.24 = 128.79/x
  3. Step 3: Cross multiply
    149.63x = 206.24 × 128.79
  4. Step 4: Simplify right side
    149.63x = 26,561.01
  5. Step 5: Solve for x
    x = 26,561.01/149.63
  6. Step 6: Final answer
    x = 177.52

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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.