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Finding the Fourth Proportional to 75.77, 104.30 and 66.54

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Solution

The fourth proportional to 75.77, 104.30 and 66.54 is: 91.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.77 : 104.30 = 66.54 : x
  2. Step 2: Convert to fraction form
    75.77/104.30 = 66.54/x
  3. Step 3: Cross multiply
    75.77x = 104.30 × 66.54
  4. Step 4: Simplify right side
    75.77x = 6,939.79
  5. Step 5: Solve for x
    x = 6,939.79/75.77
  6. Step 6: Final answer
    x = 91.60

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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.