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Finding the Fourth Proportional to 53.21, 73.43 and 31.38

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Solution

The fourth proportional to 53.21, 73.43 and 31.38 is: 43.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.21 : 73.43 = 31.38 : x
  2. Step 2: Convert to fraction form
    53.21/73.43 = 31.38/x
  3. Step 3: Cross multiply
    53.21x = 73.43 × 31.38
  4. Step 4: Simplify right side
    53.21x = 2,304.08
  5. Step 5: Solve for x
    x = 2,304.08/53.21
  6. Step 6: Final answer
    x = 43.31

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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.