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Finding the Fourth Proportional to 65.15, 97.66 and 30.90

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Solution

The fourth proportional to 65.15, 97.66 and 30.90 is: 46.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.15 : 97.66 = 30.90 : x
  2. Step 2: Convert to fraction form
    65.15/97.66 = 30.90/x
  3. Step 3: Cross multiply
    65.15x = 97.66 × 30.90
  4. Step 4: Simplify right side
    65.15x = 3,017.62
  5. Step 5: Solve for x
    x = 3,017.62/65.15
  6. Step 6: Final answer
    x = 46.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.