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Finding the Fourth Proportional to 126.66, 174.88 and 91.72

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Solution

The fourth proportional to 126.66, 174.88 and 91.72 is: 126.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.66 : 174.88 = 91.72 : x
  2. Step 2: Convert to fraction form
    126.66/174.88 = 91.72/x
  3. Step 3: Cross multiply
    126.66x = 174.88 × 91.72
  4. Step 4: Simplify right side
    126.66x = 16,039.99
  5. Step 5: Solve for x
    x = 16,039.99/126.66
  6. Step 6: Final answer
    x = 126.64

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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.