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Finding the Fourth Proportional to 66.36, 99.57 and 51.21

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Solution

The fourth proportional to 66.36, 99.57 and 51.21 is: 76.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.36 : 99.57 = 51.21 : x
  2. Step 2: Convert to fraction form
    66.36/99.57 = 51.21/x
  3. Step 3: Cross multiply
    66.36x = 99.57 × 51.21
  4. Step 4: Simplify right side
    66.36x = 5,098.98
  5. Step 5: Solve for x
    x = 5,098.98/66.36
  6. Step 6: Final answer
    x = 76.84

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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.