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Finding the Fourth Proportional to 133.60, 200.30 and 72.80

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Solution

The fourth proportional to 133.60, 200.30 and 72.80 is: 109.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.60 : 200.30 = 72.80 : x
  2. Step 2: Convert to fraction form
    133.60/200.30 = 72.80/x
  3. Step 3: Cross multiply
    133.60x = 200.30 × 72.80
  4. Step 4: Simplify right side
    133.60x = 14,581.84
  5. Step 5: Solve for x
    x = 14,581.84/133.60
  6. Step 6: Final answer
    x = 109.15

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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.