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Finding the Fourth Proportional to 94.78, 130.78 and 55.43

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Solution

The fourth proportional to 94.78, 130.78 and 55.43 is: 76.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.78 : 130.78 = 55.43 : x
  2. Step 2: Convert to fraction form
    94.78/130.78 = 55.43/x
  3. Step 3: Cross multiply
    94.78x = 130.78 × 55.43
  4. Step 4: Simplify right side
    94.78x = 7,249.78
  5. Step 5: Solve for x
    x = 7,249.78/94.78
  6. Step 6: Final answer
    x = 76.49

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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.