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Finding the Fourth Proportional to 130.21, 194.11 and 127.78

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Solution

The fourth proportional to 130.21, 194.11 and 127.78 is: 190.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.21 : 194.11 = 127.78 : x
  2. Step 2: Convert to fraction form
    130.21/194.11 = 127.78/x
  3. Step 3: Cross multiply
    130.21x = 194.11 × 127.78
  4. Step 4: Simplify right side
    130.21x = 24,803.38
  5. Step 5: Solve for x
    x = 24,803.38/130.21
  6. Step 6: Final answer
    x = 190.49

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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.