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Finding the Fourth Proportional to 53.72, 73.94 and 39.88

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Solution

The fourth proportional to 53.72, 73.94 and 39.88 is: 54.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.72 : 73.94 = 39.88 : x
  2. Step 2: Convert to fraction form
    53.72/73.94 = 39.88/x
  3. Step 3: Cross multiply
    53.72x = 73.94 × 39.88
  4. Step 4: Simplify right side
    53.72x = 2,948.73
  5. Step 5: Solve for x
    x = 2,948.73/53.72
  6. Step 6: Final answer
    x = 54.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.