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Finding the Fourth Proportional to 215.19, 297 and 127.91

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Solution

The fourth proportional to 215.19, 297 and 127.91 is: 176.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.19 : 297 = 127.91 : x
  2. Step 2: Convert to fraction form
    215.19/297 = 127.91/x
  3. Step 3: Cross multiply
    215.19x = 297 × 127.91
  4. Step 4: Simplify right side
    215.19x = 37,990.01
  5. Step 5: Solve for x
    x = 37,990.01/215.19
  6. Step 6: Final answer
    x = 176.54

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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.