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Finding the Fourth Proportional to 215.10, 296.78 and 127.74

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Solution

The fourth proportional to 215.10, 296.78 and 127.74 is: 176.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.10 : 296.78 = 127.74 : x
  2. Step 2: Convert to fraction form
    215.10/296.78 = 127.74/x
  3. Step 3: Cross multiply
    215.10x = 296.78 × 127.74
  4. Step 4: Simplify right side
    215.10x = 37,910.68
  5. Step 5: Solve for x
    x = 37,910.68/215.10
  6. Step 6: Final answer
    x = 176.25

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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.