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Finding the Fourth Proportional to 76.40, 105.32 and 63.44

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Solution

The fourth proportional to 76.40, 105.32 and 63.44 is: 87.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.40 : 105.32 = 63.44 : x
  2. Step 2: Convert to fraction form
    76.40/105.32 = 63.44/x
  3. Step 3: Cross multiply
    76.40x = 105.32 × 63.44
  4. Step 4: Simplify right side
    76.40x = 6,681.50
  5. Step 5: Solve for x
    x = 6,681.50/76.40
  6. Step 6: Final answer
    x = 87.45

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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.