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Finding the Fourth Proportional to 53.58, 73.91 and 31.73

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Solution

The fourth proportional to 53.58, 73.91 and 31.73 is: 43.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.58 : 73.91 = 31.73 : x
  2. Step 2: Convert to fraction form
    53.58/73.91 = 31.73/x
  3. Step 3: Cross multiply
    53.58x = 73.91 × 31.73
  4. Step 4: Simplify right side
    53.58x = 2,344.64
  5. Step 5: Solve for x
    x = 2,344.64/53.58
  6. Step 6: Final answer
    x = 43.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.