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Finding the Fourth Proportional to 94.00, 140.78 and 55.40

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Solution

The fourth proportional to 94.00, 140.78 and 55.40 is: 82.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.00 : 140.78 = 55.40 : x
  2. Step 2: Convert to fraction form
    94.00/140.78 = 55.40/x
  3. Step 3: Cross multiply
    94.00x = 140.78 × 55.40
  4. Step 4: Simplify right side
    94.00x = 7,799.49
  5. Step 5: Solve for x
    x = 7,799.49/94.00
  6. Step 6: Final answer
    x = 82.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.