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Finding the Fourth Proportional to 86.77, 119.75 and 66.01

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Solution

The fourth proportional to 86.77, 119.75 and 66.01 is: 91.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.77 : 119.75 = 66.01 : x
  2. Step 2: Convert to fraction form
    86.77/119.75 = 66.01/x
  3. Step 3: Cross multiply
    86.77x = 119.75 × 66.01
  4. Step 4: Simplify right side
    86.77x = 7,904.70
  5. Step 5: Solve for x
    x = 7,904.70/86.77
  6. Step 6: Final answer
    x = 91.10

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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.