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Finding the Fourth Proportional to 53.38, 80.34 and 45.55

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Solution

The fourth proportional to 53.38, 80.34 and 45.55 is: 68.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.38 : 80.34 = 45.55 : x
  2. Step 2: Convert to fraction form
    53.38/80.34 = 45.55/x
  3. Step 3: Cross multiply
    53.38x = 80.34 × 45.55
  4. Step 4: Simplify right side
    53.38x = 3,658.86
  5. Step 5: Solve for x
    x = 3,658.86/53.38
  6. Step 6: Final answer
    x = 68.55

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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.