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Finding the Fourth Proportional to 153.91, 212.35 and 98.70

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Solution

The fourth proportional to 153.91, 212.35 and 98.70 is: 136.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.91 : 212.35 = 98.70 : x
  2. Step 2: Convert to fraction form
    153.91/212.35 = 98.70/x
  3. Step 3: Cross multiply
    153.91x = 212.35 × 98.70
  4. Step 4: Simplify right side
    153.91x = 20,958.95
  5. Step 5: Solve for x
    x = 20,958.95/153.91
  6. Step 6: Final answer
    x = 136.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.