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Finding the Fourth Proportional to 118.95, 178.43 and 70.75

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Solution

The fourth proportional to 118.95, 178.43 and 70.75 is: 106.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.95 : 178.43 = 70.75 : x
  2. Step 2: Convert to fraction form
    118.95/178.43 = 70.75/x
  3. Step 3: Cross multiply
    118.95x = 178.43 × 70.75
  4. Step 4: Simplify right side
    118.95x = 12,623.92
  5. Step 5: Solve for x
    x = 12,623.92/118.95
  6. Step 6: Final answer
    x = 106.13

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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.