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Finding the Fourth Proportional to 212.58, 293.39 and 128.61

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Solution

The fourth proportional to 212.58, 293.39 and 128.61 is: 177.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.58 : 293.39 = 128.61 : x
  2. Step 2: Convert to fraction form
    212.58/293.39 = 128.61/x
  3. Step 3: Cross multiply
    212.58x = 293.39 × 128.61
  4. Step 4: Simplify right side
    212.58x = 37,732.24
  5. Step 5: Solve for x
    x = 37,732.24/212.58
  6. Step 6: Final answer
    x = 177.50

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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.