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Finding the Fourth Proportional to 126.90, 188.85 and 126.72

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Solution

The fourth proportional to 126.90, 188.85 and 126.72 is: 188.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.90 : 188.85 = 126.72 : x
  2. Step 2: Convert to fraction form
    126.90/188.85 = 126.72/x
  3. Step 3: Cross multiply
    126.90x = 188.85 × 126.72
  4. Step 4: Simplify right side
    126.90x = 23,931.07
  5. Step 5: Solve for x
    x = 23,931.07/126.90
  6. Step 6: Final answer
    x = 188.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.