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Finding the Fourth Proportional to 53.21, 79.74 and 45.56

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Solution

The fourth proportional to 53.21, 79.74 and 45.56 is: 68.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.21 : 79.74 = 45.56 : x
  2. Step 2: Convert to fraction form
    53.21/79.74 = 45.56/x
  3. Step 3: Cross multiply
    53.21x = 79.74 × 45.56
  4. Step 4: Simplify right side
    53.21x = 3,632.56
  5. Step 5: Solve for x
    x = 3,632.56/53.21
  6. Step 6: Final answer
    x = 68.27

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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.