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Finding the Fourth Proportional to 77.82, 117 and 64.18

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Solution

The fourth proportional to 77.82, 117 and 64.18 is: 96.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.82 : 117 = 64.18 : x
  2. Step 2: Convert to fraction form
    77.82/117 = 64.18/x
  3. Step 3: Cross multiply
    77.82x = 117 × 64.18
  4. Step 4: Simplify right side
    77.82x = 7,509.06
  5. Step 5: Solve for x
    x = 7,509.06/77.82
  6. Step 6: Final answer
    x = 96.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.