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Finding the Fourth Proportional to 76.40, 105.44 and 65.52

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Solution

The fourth proportional to 76.40, 105.44 and 65.52 is: 90.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.40 : 105.44 = 65.52 : x
  2. Step 2: Convert to fraction form
    76.40/105.44 = 65.52/x
  3. Step 3: Cross multiply
    76.40x = 105.44 × 65.52
  4. Step 4: Simplify right side
    76.40x = 6,908.43
  5. Step 5: Solve for x
    x = 6,908.43/76.40
  6. Step 6: Final answer
    x = 90.42

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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.