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Finding the Fourth Proportional to 66.30, 91.39 and 55.94

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Solution

The fourth proportional to 66.30, 91.39 and 55.94 is: 77.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.30 : 91.39 = 55.94 : x
  2. Step 2: Convert to fraction form
    66.30/91.39 = 55.94/x
  3. Step 3: Cross multiply
    66.30x = 91.39 × 55.94
  4. Step 4: Simplify right side
    66.30x = 5,112.36
  5. Step 5: Solve for x
    x = 5,112.36/66.30
  6. Step 6: Final answer
    x = 77.11

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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.