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Finding the Fourth Proportional to 86.02, 118.59 and 66.58

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Solution

The fourth proportional to 86.02, 118.59 and 66.58 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.02 : 118.59 = 66.58 : x
  2. Step 2: Convert to fraction form
    86.02/118.59 = 66.58/x
  3. Step 3: Cross multiply
    86.02x = 118.59 × 66.58
  4. Step 4: Simplify right side
    86.02x = 7,895.72
  5. Step 5: Solve for x
    x = 7,895.72/86.02
  6. Step 6: Final answer
    x = 91.79

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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.