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Finding the Fourth Proportional to 118.90, 178.70 and 98.74

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Solution

The fourth proportional to 118.90, 178.70 and 98.74 is: 148.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.90 : 178.70 = 98.74 : x
  2. Step 2: Convert to fraction form
    118.90/178.70 = 98.74/x
  3. Step 3: Cross multiply
    118.90x = 178.70 × 98.74
  4. Step 4: Simplify right side
    118.90x = 17,644.84
  5. Step 5: Solve for x
    x = 17,644.84/118.90
  6. Step 6: Final answer
    x = 148.40

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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.