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Finding the Fourth Proportional to 65.96, 91.07 and 42.66

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Solution

The fourth proportional to 65.96, 91.07 and 42.66 is: 58.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.96 : 91.07 = 42.66 : x
  2. Step 2: Convert to fraction form
    65.96/91.07 = 42.66/x
  3. Step 3: Cross multiply
    65.96x = 91.07 × 42.66
  4. Step 4: Simplify right side
    65.96x = 3,884.83
  5. Step 5: Solve for x
    x = 3,884.83/65.96
  6. Step 6: Final answer
    x = 58.90

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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.