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Finding the Fourth Proportional to 119.91, 165.43 and 70.78

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Solution

The fourth proportional to 119.91, 165.43 and 70.78 is: 97.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.91 : 165.43 = 70.78 : x
  2. Step 2: Convert to fraction form
    119.91/165.43 = 70.78/x
  3. Step 3: Cross multiply
    119.91x = 165.43 × 70.78
  4. Step 4: Simplify right side
    119.91x = 11,707.95
  5. Step 5: Solve for x
    x = 11,707.95/119.91
  6. Step 6: Final answer
    x = 97.64

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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.