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Finding the Fourth Proportional to 53.21, 79.41 and 45.51

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Solution

The fourth proportional to 53.21, 79.41 and 45.51 is: 67.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.21 : 79.41 = 45.51 : x
  2. Step 2: Convert to fraction form
    53.21/79.41 = 45.51/x
  3. Step 3: Cross multiply
    53.21x = 79.41 × 45.51
  4. Step 4: Simplify right side
    53.21x = 3,613.88
  5. Step 5: Solve for x
    x = 3,613.88/53.21
  6. Step 6: Final answer
    x = 67.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.