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Finding the Fourth Proportional to 104.70, 144.48 and 65.42

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Solution

The fourth proportional to 104.70, 144.48 and 65.42 is: 90.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.70 : 144.48 = 65.42 : x
  2. Step 2: Convert to fraction form
    104.70/144.48 = 65.42/x
  3. Step 3: Cross multiply
    104.70x = 144.48 × 65.42
  4. Step 4: Simplify right side
    104.70x = 9,451.95
  5. Step 5: Solve for x
    x = 9,451.95/104.70
  6. Step 6: Final answer
    x = 90.27

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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.