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Finding the Fourth Proportional to 53.64, 80.91 and 50.31

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Solution

The fourth proportional to 53.64, 80.91 and 50.31 is: 75.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.64 : 80.91 = 50.31 : x
  2. Step 2: Convert to fraction form
    53.64/80.91 = 50.31/x
  3. Step 3: Cross multiply
    53.64x = 80.91 × 50.31
  4. Step 4: Simplify right side
    53.64x = 4,070.58
  5. Step 5: Solve for x
    x = 4,070.58/53.64
  6. Step 6: Final answer
    x = 75.89

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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.