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Finding the Fourth Proportional to 119.88, 165.39 and 70.72

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Solution

The fourth proportional to 119.88, 165.39 and 70.72 is: 97.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.88 : 165.39 = 70.72 : x
  2. Step 2: Convert to fraction form
    119.88/165.39 = 70.72/x
  3. Step 3: Cross multiply
    119.88x = 165.39 × 70.72
  4. Step 4: Simplify right side
    119.88x = 11,697.03
  5. Step 5: Solve for x
    x = 11,697.03/119.88
  6. Step 6: Final answer
    x = 97.57

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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.