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Finding the Fourth Proportional to 79.76, 109.82 and 65.93

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Solution

The fourth proportional to 79.76, 109.82 and 65.93 is: 90.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.76 : 109.82 = 65.93 : x
  2. Step 2: Convert to fraction form
    79.76/109.82 = 65.93/x
  3. Step 3: Cross multiply
    79.76x = 109.82 × 65.93
  4. Step 4: Simplify right side
    79.76x = 7,239.88
  5. Step 5: Solve for x
    x = 7,239.88/79.76
  6. Step 6: Final answer
    x = 90.77

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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.