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Finding the Fourth Proportional to 66.15, 91.19 and 55.82

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Solution

The fourth proportional to 66.15, 91.19 and 55.82 is: 76.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.15 : 91.19 = 55.82 : x
  2. Step 2: Convert to fraction form
    66.15/91.19 = 55.82/x
  3. Step 3: Cross multiply
    66.15x = 91.19 × 55.82
  4. Step 4: Simplify right side
    66.15x = 5,090.59
  5. Step 5: Solve for x
    x = 5,090.59/66.15
  6. Step 6: Final answer
    x = 76.96

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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.