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Finding the Fourth Proportional to 53.43, 73.74 and 31.31

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Solution

The fourth proportional to 53.43, 73.74 and 31.31 is: 43.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.43 : 73.74 = 31.31 : x
  2. Step 2: Convert to fraction form
    53.43/73.74 = 31.31/x
  3. Step 3: Cross multiply
    53.43x = 73.74 × 31.31
  4. Step 4: Simplify right side
    53.43x = 2,308.72
  5. Step 5: Solve for x
    x = 2,308.72/53.43
  6. Step 6: Final answer
    x = 43.21

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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.