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Finding the Fourth Proportional to 133.19, 199.82 and 78.39

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Solution

The fourth proportional to 133.19, 199.82 and 78.39 is: 117.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    133.19 : 199.82 = 78.39 : x
  2. Step 2: Convert to fraction form
    133.19/199.82 = 78.39/x
  3. Step 3: Cross multiply
    133.19x = 199.82 × 78.39
  4. Step 4: Simplify right side
    133.19x = 15,663.50
  5. Step 5: Solve for x
    x = 15,663.50/133.19
  6. Step 6: Final answer
    x = 117.60

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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.