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Finding the Fourth Proportional to 53.56, 79.87 and 49.96

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Solution

The fourth proportional to 53.56, 79.87 and 49.96 is: 74.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.56 : 79.87 = 49.96 : x
  2. Step 2: Convert to fraction form
    53.56/79.87 = 49.96/x
  3. Step 3: Cross multiply
    53.56x = 79.87 × 49.96
  4. Step 4: Simplify right side
    53.56x = 3,990.31
  5. Step 5: Solve for x
    x = 3,990.31/53.56
  6. Step 6: Final answer
    x = 74.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.