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Finding the Fourth Proportional to 53.56, 80.82 and 51.45

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Solution

The fourth proportional to 53.56, 80.82 and 51.45 is: 77.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.56 : 80.82 = 51.45 : x
  2. Step 2: Convert to fraction form
    53.56/80.82 = 51.45/x
  3. Step 3: Cross multiply
    53.56x = 80.82 × 51.45
  4. Step 4: Simplify right side
    53.56x = 4,158.49
  5. Step 5: Solve for x
    x = 4,158.49/53.56
  6. Step 6: Final answer
    x = 77.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.