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Finding the Fourth Proportional to 53.75, 80.56 and 28.07

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Solution

The fourth proportional to 53.75, 80.56 and 28.07 is: 42.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.75 : 80.56 = 28.07 : x
  2. Step 2: Convert to fraction form
    53.75/80.56 = 28.07/x
  3. Step 3: Cross multiply
    53.75x = 80.56 × 28.07
  4. Step 4: Simplify right side
    53.75x = 2,261.32
  5. Step 5: Solve for x
    x = 2,261.32/53.75
  6. Step 6: Final answer
    x = 42.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.