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Finding the Fourth Proportional to 133.29, 199.98 and 72.40

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Solution

The fourth proportional to 133.29, 199.98 and 72.40 is: 108.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.29 : 199.98 = 72.40 : x
  2. Step 2: Convert to fraction form
    133.29/199.98 = 72.40/x
  3. Step 3: Cross multiply
    133.29x = 199.98 × 72.40
  4. Step 4: Simplify right side
    133.29x = 14,478.55
  5. Step 5: Solve for x
    x = 14,478.55/133.29
  6. Step 6: Final answer
    x = 108.62

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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.