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Finding the Fourth Proportional to 118.74, 178.08 and 98.46

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Solution

The fourth proportional to 118.74, 178.08 and 98.46 is: 147.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.74 : 178.08 = 98.46 : x
  2. Step 2: Convert to fraction form
    118.74/178.08 = 98.46/x
  3. Step 3: Cross multiply
    118.74x = 178.08 × 98.46
  4. Step 4: Simplify right side
    118.74x = 17,533.76
  5. Step 5: Solve for x
    x = 17,533.76/118.74
  6. Step 6: Final answer
    x = 147.67

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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.