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Finding the Fourth Proportional to 53.37, 80.04 and 20.86

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Solution

The fourth proportional to 53.37, 80.04 and 20.86 is: 31.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.37 : 80.04 = 20.86 : x
  2. Step 2: Convert to fraction form
    53.37/80.04 = 20.86/x
  3. Step 3: Cross multiply
    53.37x = 80.04 × 20.86
  4. Step 4: Simplify right side
    53.37x = 1,669.63
  5. Step 5: Solve for x
    x = 1,669.63/53.37
  6. Step 6: Final answer
    x = 31.28

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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.