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Finding the Fourth Proportional to 80.21, 110.75 and 65.46

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Solution

The fourth proportional to 80.21, 110.75 and 65.46 is: 90.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.21 : 110.75 = 65.46 : x
  2. Step 2: Convert to fraction form
    80.21/110.75 = 65.46/x
  3. Step 3: Cross multiply
    80.21x = 110.75 × 65.46
  4. Step 4: Simplify right side
    80.21x = 7,248.81
  5. Step 5: Solve for x
    x = 7,248.81/80.21
  6. Step 6: Final answer
    x = 90.38

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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.