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Finding the Fourth Proportional to 77.66, 117.01 and 65.07

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Solution

The fourth proportional to 77.66, 117.01 and 65.07 is: 98.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.66 : 117.01 = 65.07 : x
  2. Step 2: Convert to fraction form
    77.66/117.01 = 65.07/x
  3. Step 3: Cross multiply
    77.66x = 117.01 × 65.07
  4. Step 4: Simplify right side
    77.66x = 7,613.92
  5. Step 5: Solve for x
    x = 7,613.92/77.66
  6. Step 6: Final answer
    x = 98.04

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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.