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Finding the Fourth Proportional to 104.56, 144.30 and 65.74

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Solution

The fourth proportional to 104.56, 144.30 and 65.74 is: 90.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.56 : 144.30 = 65.74 : x
  2. Step 2: Convert to fraction form
    104.56/144.30 = 65.74/x
  3. Step 3: Cross multiply
    104.56x = 144.30 × 65.74
  4. Step 4: Simplify right side
    104.56x = 9,486.28
  5. Step 5: Solve for x
    x = 9,486.28/104.56
  6. Step 6: Final answer
    x = 90.73

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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.