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Finding the Fourth Proportional to 53.75, 74.12 and 34.31

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Solution

The fourth proportional to 53.75, 74.12 and 34.31 is: 47.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.75 : 74.12 = 34.31 : x
  2. Step 2: Convert to fraction form
    53.75/74.12 = 34.31/x
  3. Step 3: Cross multiply
    53.75x = 74.12 × 34.31
  4. Step 4: Simplify right side
    53.75x = 2,543.07
  5. Step 5: Solve for x
    x = 2,543.07/53.75
  6. Step 6: Final answer
    x = 47.31

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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.