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Finding the Fourth Proportional to 51.16, 76.59 and 43.21

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Solution

The fourth proportional to 51.16, 76.59 and 43.21 is: 64.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.16 : 76.59 = 43.21 : x
  2. Step 2: Convert to fraction form
    51.16/76.59 = 43.21/x
  3. Step 3: Cross multiply
    51.16x = 76.59 × 43.21
  4. Step 4: Simplify right side
    51.16x = 3,309.45
  5. Step 5: Solve for x
    x = 3,309.45/51.16
  6. Step 6: Final answer
    x = 64.69

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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.