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Finding the Fourth Proportional to 70.79, 97.92 and 66.22

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Solution

The fourth proportional to 70.79, 97.92 and 66.22 is: 91.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.79 : 97.92 = 66.22 : x
  2. Step 2: Convert to fraction form
    70.79/97.92 = 66.22/x
  3. Step 3: Cross multiply
    70.79x = 97.92 × 66.22
  4. Step 4: Simplify right side
    70.79x = 6,483.77
  5. Step 5: Solve for x
    x = 6,483.77/70.79
  6. Step 6: Final answer
    x = 91.59

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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.