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Finding the Fourth Proportional to 94.75, 130.73 and 55.40

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Solution

The fourth proportional to 94.75, 130.73 and 55.40 is: 76.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.75 : 130.73 = 55.40 : x
  2. Step 2: Convert to fraction form
    94.75/130.73 = 55.40/x
  3. Step 3: Cross multiply
    94.75x = 130.73 × 55.40
  4. Step 4: Simplify right side
    94.75x = 7,241.79
  5. Step 5: Solve for x
    x = 7,241.79/94.75
  6. Step 6: Final answer
    x = 76.43

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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.