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Finding the Fourth Proportional to 194.50, 291.70 and 72.70

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Solution

The fourth proportional to 194.50, 291.70 and 72.70 is: 109.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.50 : 291.70 = 72.70 : x
  2. Step 2: Convert to fraction form
    194.50/291.70 = 72.70/x
  3. Step 3: Cross multiply
    194.50x = 291.70 × 72.70
  4. Step 4: Simplify right side
    194.50x = 21,205.95
  5. Step 5: Solve for x
    x = 21,205.95/194.50
  6. Step 6: Final answer
    x = 109.03

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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.