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Finding the Fourth Proportional to 77.94, 117.18 and 66.60

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Solution

The fourth proportional to 77.94, 117.18 and 66.60 is: 100.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.94 : 117.18 = 66.60 : x
  2. Step 2: Convert to fraction form
    77.94/117.18 = 66.60/x
  3. Step 3: Cross multiply
    77.94x = 117.18 × 66.60
  4. Step 4: Simplify right side
    77.94x = 7,804.19
  5. Step 5: Solve for x
    x = 7,804.19/77.94
  6. Step 6: Final answer
    x = 100.13

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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.