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Finding the Fourth Proportional to 77.44, 116.68 and 64.21

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Solution

The fourth proportional to 77.44, 116.68 and 64.21 is: 96.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.44 : 116.68 = 64.21 : x
  2. Step 2: Convert to fraction form
    77.44/116.68 = 64.21/x
  3. Step 3: Cross multiply
    77.44x = 116.68 × 64.21
  4. Step 4: Simplify right side
    77.44x = 7,492.02
  5. Step 5: Solve for x
    x = 7,492.02/77.44
  6. Step 6: Final answer
    x = 96.75

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.