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Finding the Fourth Proportional to 104.50, 144.21 and 65.76

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Solution

The fourth proportional to 104.50, 144.21 and 65.76 is: 90.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.50 : 144.21 = 65.76 : x
  2. Step 2: Convert to fraction form
    104.50/144.21 = 65.76/x
  3. Step 3: Cross multiply
    104.50x = 144.21 × 65.76
  4. Step 4: Simplify right side
    104.50x = 9,483.25
  5. Step 5: Solve for x
    x = 9,483.25/104.50
  6. Step 6: Final answer
    x = 90.75

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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.