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Finding the Fourth Proportional to 118.95, 178.21 and 64.89

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Solution

The fourth proportional to 118.95, 178.21 and 64.89 is: 97.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.95 : 178.21 = 64.89 : x
  2. Step 2: Convert to fraction form
    118.95/178.21 = 64.89/x
  3. Step 3: Cross multiply
    118.95x = 178.21 × 64.89
  4. Step 4: Simplify right side
    118.95x = 11,563.72
  5. Step 5: Solve for x
    x = 11,563.72/118.95
  6. Step 6: Final answer
    x = 97.21

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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.