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Finding the Fourth Proportional to 65.15, 97.73 and 21.80

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Solution

The fourth proportional to 65.15, 97.73 and 21.80 is: 32.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.15 : 97.73 = 21.80 : x
  2. Step 2: Convert to fraction form
    65.15/97.73 = 21.80/x
  3. Step 3: Cross multiply
    65.15x = 97.73 × 21.80
  4. Step 4: Simplify right side
    65.15x = 2,129.92
  5. Step 5: Solve for x
    x = 2,129.92/65.15
  6. Step 6: Final answer
    x = 32.70

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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.