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Finding the Fourth Proportional to 215.12, 296.89 and 127.79

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Solution

The fourth proportional to 215.12, 296.89 and 127.79 is: 176.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.12 : 296.89 = 127.79 : x
  2. Step 2: Convert to fraction form
    215.12/296.89 = 127.79/x
  3. Step 3: Cross multiply
    215.12x = 296.89 × 127.79
  4. Step 4: Simplify right side
    215.12x = 37,939.57
  5. Step 5: Solve for x
    x = 37,939.57/215.12
  6. Step 6: Final answer
    x = 176.36

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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.