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Finding the Fourth Proportional to 43.21, 64.81 and 12.77

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Solution

The fourth proportional to 43.21, 64.81 and 12.77 is: 19.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.21 : 64.81 = 12.77 : x
  2. Step 2: Convert to fraction form
    43.21/64.81 = 12.77/x
  3. Step 3: Cross multiply
    43.21x = 64.81 × 12.77
  4. Step 4: Simplify right side
    43.21x = 827.67
  5. Step 5: Solve for x
    x = 827.67/43.21
  6. Step 6: Final answer
    x = 19.16

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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.